diff --git a/lib/Federation/CloudFederationProviderTalk.php b/lib/Federation/CloudFederationProviderTalk.php
index f36722f1adc..256a11b6902 100644
--- a/lib/Federation/CloudFederationProviderTalk.php
+++ b/lib/Federation/CloudFederationProviderTalk.php
@@ -9,6 +9,7 @@
 namespace OCA\Talk\Federation;
 
 use Exception;
+use NCU\Federation\ISignedCloudFederationProvider;
 use OCA\FederatedFileSharing\AddressHandler;
 use OCA\Talk\AppInfo\Application;
 use OCA\Talk\CachePrefix;
@@ -36,6 +37,7 @@
 use OCA\Talk\Service\ProxyCacheMessageService;
 use OCA\Talk\Service\RoomService;
 use OCP\AppFramework\Db\DoesNotExistException;
+use OCP\AppFramework\Db\MultipleObjectsReturnedException;
 use OCP\AppFramework\Http;
 use OCP\AppFramework\Services\IAppConfig;
 use OCP\AppFramework\Utility\ITimeFactory;
@@ -59,7 +61,7 @@
 use Psr\Log\LoggerInterface;
 use SensitiveParameter;
 
-class CloudFederationProviderTalk implements ICloudFederationProvider {
+class CloudFederationProviderTalk implements ICloudFederationProvider, ISignedCloudFederationProvider {
 	protected ?ICache $proxyCacheMessages;
 
 	public function __construct(
@@ -639,8 +641,25 @@ public function getSupportedShareTypes(): array {
 	 * @param string $token
 	 * @return string|array
 	 */
-	public function getFederationIdFromToken(string $token): string|array {
-		$invite = $this->invitationMapper->getByAccessToken($token);
-		return [$invite->getLocalCloudId(), $invite->getInviterCloudId()];
+	public function getFederationIdsFromSharedSecret(
+		#[SensitiveParameter]
+		string $sharedSecret,
+		array $payload,
+	): array {
+		try {
+			$invite = $this->invitationMapper->getByRemoteServerOnlyWithAccessToken($payload['remoteServerUrl'], $sharedSecret);
+			return [$invite->getLocalCloudId(), $invite->getInviterCloudId()];
+		} catch (DoesNotExistException) {
+		}
+
+		try {
+			$attendee = $this->attendeeMapper->getByAccessToken($sharedSecret);
+			if (str_ends_with($attendee->getActorId(), $payload['remoteServerUrl'])) {
+				return [$attendee->getActorId()];
+			}
+		} catch (DoesNotExistException|MultipleObjectsReturnedException) {
+		}
+
+		return [];
 	}
 }
diff --git a/lib/Model/AttendeeMapper.php b/lib/Model/AttendeeMapper.php
index b3e73c5c582..4d46e928007 100644
--- a/lib/Model/AttendeeMapper.php
+++ b/lib/Model/AttendeeMapper.php
@@ -53,6 +53,19 @@ public function getById(int $id): Attendee {
 		return $this->findEntity($query);
 	}
 
+	/**
+	 * @throws DoesNotExistException
+	 * @throws MultipleObjectsReturnedException
+	 */
+	public function getByAccessToken(string $accessToken): Attendee {
+		$query = $this->db->getQueryBuilder();
+		$query->select('*')
+			->from($this->getTableName())
+			->where($query->expr()->eq('access_token', $query->createNamedParameter($accessToken)));
+
+		return $this->findEntity($query);
+	}
+
 	/**
 	 * @throws DoesNotExistException
 	 * @throws MultipleObjectsReturnedException
diff --git a/lib/Model/InvitationMapper.php b/lib/Model/InvitationMapper.php
index 130ddd9d32b..7221a8842de 100644
--- a/lib/Model/InvitationMapper.php
+++ b/lib/Model/InvitationMapper.php
@@ -10,6 +10,7 @@
 
 use OCA\Talk\Room;
 use OCP\AppFramework\Db\DoesNotExistException;
+use OCP\AppFramework\Db\MultipleObjectsReturnedException;
 use OCP\AppFramework\Db\QBMapper;
 use OCP\DB\QueryBuilder\IQueryBuilder;
 use OCP\IDBConnection;
@@ -48,7 +49,8 @@ public function getInvitationById(int $id): Invitation {
 	 * @throws DoesNotExistException
 	 * @internal Does not check user relation
 	 */
-	public function getByAccessToken(
+	public function getByRemoteServerOnlyWithAccessToken(
+		string $remoteServerUrl,
 		#[SensitiveParameter]
 		string $accessToken,
 	): Invitation {
@@ -56,7 +58,8 @@ public function getByAccessToken(
 
 		$qb->select('*')
 			->from($this->getTableName())
-			->where($qb->expr()->eq('access_token', $qb->createNamedParameter($accessToken)));
+			->where($qb->expr()->eq('remote_server_url', $qb->createNamedParameter($remoteServerUrl)))
+			->andWhere($qb->expr()->eq('access_token', $qb->createNamedParameter($accessToken)));
 
 		return $this->findEntity($qb);
 	}
diff --git a/tests/psalm-baseline.xml b/tests/psalm-baseline.xml
index b3031a6c16a..eaba79ac968 100644
--- a/tests/psalm-baseline.xml
+++ b/tests/psalm-baseline.xml
@@ -1,6 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<files psalm-version="5.26.0@4787eaf414e16c661902b94dfe5d882223e5b513">
+<files psalm-version="5.26.1@d747f6500b38ac4f7dfc5edbcae6e4b637d7add0">
   <file src="lib/AppInfo/Application.php">
+    <MissingDependency>
+      <code><![CDATA[CloudFederationProviderTalk]]></code>
+    </MissingDependency>
     <UndefinedClass>
       <code><![CDATA[BeforeTemplateRenderedEvent]]></code>
       <code><![CDATA[BeforeTemplateRenderedEvent]]></code>
@@ -26,6 +29,17 @@
       <code><![CDATA[$this->request->server]]></code>
     </NoInterfaceProperties>
   </file>
+  <file src="lib/Federation/CloudFederationProviderTalk.php">
+    <UndefinedClass>
+      <code><![CDATA[ISignedCloudFederationProvider]]></code>
+    </UndefinedClass>
+  </file>
+  <file src="lib/Federation/Proxy/TalkV1/Listener/ResourceTypeRegisterListener.php">
+    <MissingDependency>
+      <code><![CDATA[$this->talkProvider]]></code>
+      <code><![CDATA[protected]]></code>
+    </MissingDependency>
+  </file>
   <file src="lib/Files/Util.php">
     <InvalidArgument>
       <code><![CDATA[$fileId]]></code>