Federate Sharing error

Hello,

Both servers are up, and no self-signed certificate.
When sharing a file to xxx@xxxxxxx.Fr :
→ Error creating the share: Sharing Rapport.csv failed, could not find xxx@xxxxxxx.FR, maybe the server is currently unreachable or uses a self-signed certificate.:heavy_multiplication_x:

Nextcloud snap 22.2.3 on both.

Can you help ?
Best

nextcloud.log

{“reqId”:“3BsNJ2A4BH2w9JbmH6Nb”,“level”:1,“time”:“2022-02-04T10:44:33+00:00”,“remoteAddr”:“XX.XX.XX.XX”,“user”:“XXX”,“app”:“no app in context”,“method”:“POST”,“url”:"/ocs/v2.php/apps/files_sharing/api/v1/shares",“message”:“Deprecated event type for OCP\Share::preShare: Symfony\Component\EventDispatcher\GenericEvent is used”,“userAgent”:“Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:96.0) Gecko/20100101 Firefox/96.0”,“version”:“22.2.3.0”}

{“reqId”:“3BsNJ2A4BH2w9JbmH6Nb”,“level”:1,“time”:“2022-02-04T10:44:33+00:00”,“remoteAddr”:“XX.XX.XX.XX”,“user”:“XXX”,“app”:“federatedfilesharing”,“method”:“POST”,“url”:"/ocs/v2.php/apps/files_sharing/api/v1/shares",“message”:“failed sharing Rapport.csv with XXXX@XXXXXX.fr”,“userAgent”:“Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:96.0) Gecko/20100101 Firefox/96.0”,“version”:“22.2.3.0”}

{“reqId”:“3BsNJ2A4BH2w9JbmH6Nb”,“level”:3,“time”:“2022-02-04T10:44:33+00:00”,“remoteAddr”:“XX.XX.XX.XX”,“user”:“XXX”,“app”:“no app in context”,“method”:“POST”,“url”:"/ocs/v2.php/apps/files_sharing/api/v1/shares",“message”:“Sharing Rapport.csv failed, could not find XXXX@XXXXXX.fr, maybe the server is currently unreachable or uses a self-signed certificate.”,“userAgent”:“Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:96.0) Gecko/20100101 Firefox/96.0”,“version”:“22.2.3.0”,“exception”:{“Exception”:“Exception”,“Message”:“Sharing Rapport.csv failed, could not find XXXX@XXXXXX.fr, maybe the server is currently unreachable or uses a self-signed certificate.”,“Code”:0,“Trace”:[{“file”:"/snap/nextcloud/29223/htdocs/apps/federatedfilesharing/lib/FederatedShareProvider.php",“line”:252,“function”:“createFederatedShare”,“class”:“OCA\FederatedFileSharing\FederatedShareProvider”,“type”:"->"},{“file”:"/snap/nextcloud/29223/htdocs/lib/private/Share20/Manager.php",“line”:804,“function”:“create”,“class”:“OCA\FederatedFileSharing\FederatedShareProvider”,“type”:"->"},{“file”:"/snap/nextcloud/29223/htdocs/apps/files_sharing/lib/Controller/ShareAPIController.php",“line”:657,“function”:“createShare”,“class”:“OC\Share20\Manager”,“type”:"->"},{“file”:"/snap/nextcloud/29223/htdocs/lib/private/AppFramework/Http/Dispatcher.php",“line”:217,“function”:“createShare”,“class”:“OCA\Files_Sharing\Controller\ShareAPIController”,“type”:"->"},{“file”:"/snap/nextcloud/29223/htdocs/lib/private/AppFramework/Http/Dispatcher.php",“line”:126,“function”:“executeController”,“class”:“OC\AppFramework\Http\Dispatcher”,“type”:"->"},{“file”:"/snap/nextcloud/29223/htdocs/lib/private/AppFramework/App.php",“line”:156,“function”:“dispatch”,“class”:“OC\AppFramework\Http\Dispatcher”,“type”:"->"},{“file”:"/snap/nextcloud/29223/htdocs/lib/private/Route/Router.php",“line”:302,“function”:“main”,“class”:“OC\AppFramework\App”,“type”:"::"},{“file”:"/snap/nextcloud/29223/htdocs/ocs/v1.php",“line”:62,“function”:“match”,“class”:“OC\Route\Router”,“type”:"->"},{“file”:"/snap/nextcloud/29223/htdocs/ocs/v2.php",“line”:23,“args”:["/snap/nextcloud/29223/htdocs/ocs/v1.php"],“function”:“require_once”}],“File”:"/snap/nextcloud/29223/htdocs/apps/federatedfilesharing/lib/FederatedShareProvider.php",“Line”:318,“CustomMessage”:"–"}}