diff --git a/apps/federatedfilesharing/composer/composer/autoload_classmap.php b/apps/federatedfilesharing/composer/composer/autoload_classmap.php
index 8d1364c0d6..0b07303e71 100644
--- a/apps/federatedfilesharing/composer/composer/autoload_classmap.php
+++ b/apps/federatedfilesharing/composer/composer/autoload_classmap.php
@@ -15,6 +15,7 @@ return array(
     'OCA\\FederatedFileSharing\\FederatedShareProvider' => $baseDir . '/../lib/FederatedShareProvider.php',
     'OCA\\FederatedFileSharing\\Listeners\\LoadAdditionalScriptsListener' => $baseDir . '/../lib/Listeners/LoadAdditionalScriptsListener.php',
     'OCA\\FederatedFileSharing\\Migration\\Version1010Date20200630191755' => $baseDir . '/../lib/Migration/Version1010Date20200630191755.php',
+    'OCA\\FederatedFileSharing\\Migration\\Version1011Date20201120125158' => $baseDir . '/../lib/Migration/Version1011Date20201120125158.php',
     'OCA\\FederatedFileSharing\\Notifications' => $baseDir . '/../lib/Notifications.php',
     'OCA\\FederatedFileSharing\\Notifier' => $baseDir . '/../lib/Notifier.php',
     'OCA\\FederatedFileSharing\\OCM\\CloudFederationProviderFiles' => $baseDir . '/../lib/OCM/CloudFederationProviderFiles.php',
diff --git a/apps/federatedfilesharing/composer/composer/autoload_static.php b/apps/federatedfilesharing/composer/composer/autoload_static.php
index 6e352d6f32..97ff383b90 100644
--- a/apps/federatedfilesharing/composer/composer/autoload_static.php
+++ b/apps/federatedfilesharing/composer/composer/autoload_static.php
@@ -30,6 +30,7 @@ class ComposerStaticInitFederatedFileSharing
         'OCA\\FederatedFileSharing\\FederatedShareProvider' => __DIR__ . '/..' . '/../lib/FederatedShareProvider.php',
         'OCA\\FederatedFileSharing\\Listeners\\LoadAdditionalScriptsListener' => __DIR__ . '/..' . '/../lib/Listeners/LoadAdditionalScriptsListener.php',
         'OCA\\FederatedFileSharing\\Migration\\Version1010Date20200630191755' => __DIR__ . '/..' . '/../lib/Migration/Version1010Date20200630191755.php',
+        'OCA\\FederatedFileSharing\\Migration\\Version1011Date20201120125158' => __DIR__ . '/..' . '/../lib/Migration/Version1011Date20201120125158.php',
         'OCA\\FederatedFileSharing\\Notifications' => __DIR__ . '/..' . '/../lib/Notifications.php',
         'OCA\\FederatedFileSharing\\Notifier' => __DIR__ . '/..' . '/../lib/Notifier.php',
         'OCA\\FederatedFileSharing\\OCM\\CloudFederationProviderFiles' => __DIR__ . '/..' . '/../lib/OCM/CloudFederationProviderFiles.php',
diff --git a/apps/federatedfilesharing/lib/FederatedShareProvider.php b/apps/federatedfilesharing/lib/FederatedShareProvider.php
index 2e2f0d8adb..4d60744fe3 100644
--- a/apps/federatedfilesharing/lib/FederatedShareProvider.php
+++ b/apps/federatedfilesharing/lib/FederatedShareProvider.php
@@ -462,7 +462,7 @@ class FederatedShareProvider implements IShareProvider {
 	 * @param $shareId
 	 * @param $remoteId
 	 */
-	public function storeRemoteId($shareId, $remoteId) {
+	public function storeRemoteId(int $shareId, string $remoteId): void {
 		$query = $this->dbConnection->getQueryBuilder();
 		$query->insert('federated_reshares')
 			->values(
@@ -478,10 +478,10 @@ class FederatedShareProvider implements IShareProvider {
 	 * get share ID on remote server for federated re-shares
 	 *
 	 * @param IShare $share
-	 * @return int
+	 * @return string
 	 * @throws ShareNotFound
 	 */
-	public function getRemoteId(IShare $share) {
+	public function getRemoteId(IShare $share): string {
 		$query = $this->dbConnection->getQueryBuilder();
 		$query->select('remote_id')->from('federated_reshares')
 			->where($query->expr()->eq('share_id', $query->createNamedParameter((int)$share->getId())));
diff --git a/apps/federatedfilesharing/lib/Migration/Version1010Date20200630191755.php b/apps/federatedfilesharing/lib/Migration/Version1010Date20200630191755.php
index bf0d0f8eec..b8d498f322 100644
--- a/apps/federatedfilesharing/lib/Migration/Version1010Date20200630191755.php
+++ b/apps/federatedfilesharing/lib/Migration/Version1010Date20200630191755.php
@@ -48,9 +48,9 @@ class Version1010Date20200630191755 extends SimpleMigrationStep {
 				'notnull' => true,
 				'length' => 4,
 			]);
-			$table->addColumn('remote_id', Types::INTEGER, [
+			$table->addColumn('remote_id', Types::STRING, [
 				'notnull' => true,
-				'length' => 4,
+				'length' => 255,
 			]);
 			$table->setPrimaryKey(['share_id'], 'federated_res_pk');
 //			$table->addUniqueIndex(['share_id'], 'share_id_index');
diff --git a/apps/federatedfilesharing/lib/Migration/Version1011Date20201120125158.php b/apps/federatedfilesharing/lib/Migration/Version1011Date20201120125158.php
new file mode 100644
index 0000000000..c3fc22db8e
--- /dev/null
+++ b/apps/federatedfilesharing/lib/Migration/Version1011Date20201120125158.php
@@ -0,0 +1,51 @@
+<?php
+/*
+ * @copyright Copyright (c) 2020 Julius Härtl <jus@bitgrid.net>
+ *
+ * @author Julius Härtl <jus@bitgrid.net>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+declare(strict_types=1);
+
+namespace OCA\FederatedFileSharing\Migration;
+
+use Closure;
+use Doctrine\DBAL\Types\Type;
+use Doctrine\DBAL\Types\Types;
+use OCP\DB\ISchemaWrapper;
+use OCP\Migration\IOutput;
+use OCP\Migration\SimpleMigrationStep;
+
+class Version1011Date20201120125158 extends SimpleMigrationStep {
+	public function changeSchema(IOutput $output, Closure $schemaClosure, array $options) {
+		/** @var ISchemaWrapper $schema */
+		$schema = $schemaClosure();
+		
+		if ($schema->hasTable('federated_reshares')) {
+			$table = $schema->getTable('federated_reshares');
+			$remoteIdColumn = $table->getColumn('remote_id');
+			if ($remoteIdColumn && $remoteIdColumn->getType()->getName() !== Types::STRING) {
+				$remoteIdColumn->setType(Type::getType(Types::STRING));
+				$remoteIdColumn->setOptions(['length' => 255]);
+			}
+		}
+
+		return $schema;
+	}
+}
diff --git a/apps/federatedfilesharing/lib/Notifications.php b/apps/federatedfilesharing/lib/Notifications.php
index 61513cd229..5df3c4af89 100644
--- a/apps/federatedfilesharing/lib/Notifications.php
+++ b/apps/federatedfilesharing/lib/Notifications.php
@@ -83,7 +83,7 @@ class Notifications {
 	 * @param string $token
 	 * @param string $shareWith
 	 * @param string $name
-	 * @param int $remote_id
+	 * @param string $remoteId
 	 * @param string $owner
 	 * @param string $ownerFederatedId
 	 * @param string $sharedBy
@@ -93,7 +93,7 @@ class Notifications {
 	 * @throws \OC\HintException
 	 * @throws \OC\ServerNotAvailableException
 	 */
-	public function sendRemoteShare($token, $shareWith, $name, $remote_id, $owner, $ownerFederatedId, $sharedBy, $sharedByFederatedId, $shareType) {
+	public function sendRemoteShare($token, $shareWith, $name, $remoteId, $owner, $ownerFederatedId, $sharedBy, $sharedByFederatedId, $shareType) {
 		list($user, $remote) = $this->addressHandler->splitUserRemote($shareWith);
 
 		if ($user && $remote) {
@@ -103,7 +103,7 @@ class Notifications {
 				'shareWith' => $user,
 				'token' => $token,
 				'name' => $name,
-				'remoteId' => $remote_id,
+				'remoteId' => $remoteId,
 				'owner' => $owner,
 				'ownerFederatedId' => $ownerFederatedId,
 				'sharedBy' => $sharedBy,
@@ -132,13 +132,13 @@ class Notifications {
 	 * ask owner to re-share the file with the given user
 	 *
 	 * @param string $token
-	 * @param int $id remote Id
+	 * @param string $id remote Id
 	 * @param int $shareId internal share Id
 	 * @param string $remote remote address of the owner
 	 * @param string $shareWith
 	 * @param int $permission
 	 * @param string $filename
-	 * @return bool
+	 * @return array
 	 * @throws \OC\HintException
 	 * @throws \OC\ServerNotAvailableException
 	 */
@@ -151,7 +151,7 @@ class Notifications {
 		];
 
 		$ocmFields = $fields;
-		$ocmFields['remoteId'] = $id;
+		$ocmFields['remoteId'] = (string)$id;
 		$ocmFields['localId'] = $shareId;
 		$ocmFields['name'] = $filename;
 
@@ -171,7 +171,7 @@ class Notifications {
 		if ($httpRequestSuccessful && $ocsCallSuccessful && $validToken && $validRemoteId) {
 			return [
 				$status['ocs']['data']['token'],
-				(int)$status['ocs']['data']['remoteId']
+				$status['ocs']['data']['remoteId']
 			];
 		}
 
@@ -206,7 +206,7 @@ class Notifications {
 	 * send notification to remote server if the permissions was changed
 	 *
 	 * @param string $remote
-	 * @param int $remoteId
+	 * @param string $remoteId
 	 * @param string $token
 	 * @param int $permissions
 	 * @return bool
@@ -219,7 +219,7 @@ class Notifications {
 	 * forward accept reShare to remote server
 	 *
 	 * @param string $remote
-	 * @param int $remoteId
+	 * @param string $remoteId
 	 * @param string $token
 	 */
 	public function sendAcceptShare($remote, $remoteId, $token) {
@@ -230,7 +230,7 @@ class Notifications {
 	 * forward decline reShare to remote server
 	 *
 	 * @param string $remote
-	 * @param int $remoteId
+	 * @param string $remoteId
 	 * @param string $token
 	 */
 	public function sendDeclineShare($remote, $remoteId, $token) {
@@ -242,7 +242,7 @@ class Notifications {
 	 *
 	 * @param string $remote
 	 * @param string $token
-	 * @param int $remoteId Share id on the remote host
+	 * @param string $remoteId Share id on the remote host
 	 * @param string $action possible actions: accept, decline, unshare, revoke, permissions
 	 * @param array $data
 	 * @param int $try
diff --git a/apps/files_sharing/lib/External/Manager.php b/apps/files_sharing/lib/External/Manager.php
index 526e4fcce4..e59c98b07c 100644
--- a/apps/files_sharing/lib/External/Manager.php
+++ b/apps/files_sharing/lib/External/Manager.php
@@ -126,7 +126,7 @@ class Manager {
 	 * @param int $shareType
 	 * @param boolean $accepted
 	 * @param string $user
-	 * @param int $remoteId
+	 * @param string $remoteId
 	 * @param int $parent
 	 * @return Mount|null
 	 * @throws \Doctrine\DBAL\DBALException
@@ -347,7 +347,7 @@ class Manager {
 	 *
 	 * @param string $remote
 	 * @param string $token
-	 * @param int $remoteId Share id on the remote host
+	 * @param string $remoteId Share id on the remote host
 	 * @param string $feedback
 	 * @return boolean
 	 */
@@ -388,7 +388,7 @@ class Manager {
 	 *
 	 * @param string $remoteDomain
 	 * @param string $token
-	 * @param $remoteId id of the share
+	 * @param string $remoteId id of the share
 	 * @param string $feedback
 	 * @return bool
 	 */