You're right KevinTheJedi, it was an issue with authorization in Entra ID. It looks like mail users in osTicket need the right application admin. And now we know, that mail alias adresses are not supported.
You're right KevinTheJedi, it was an issue with authorization in Entra ID. It looks like mail users in osTicket need the right application admin. And now we know, that mail alias adresses are not supported.