I suggest to check the HomeMDB attribute.
1. In the ADSIEDIT, please locate the following path, then check whether the Home MDB value is correct.
CN=Configuration,CN=Services,CN=Microsoft Exchange,CN=<org name>,CN=Administrative Groups,CN=Exchange Administrative Group (FYDIBOHF23SPDLT) ,CN=Servers,CN=<servername>,CN=Microsoft System Attendant Home MDB
2. If the value is incorrect, please locate the following path, then please copy the value and past in CN=Microsoft System Attendant Home MDB.
CN=Configuration,CN=Services,CN=Microsoft Exchange,CN=<org name>,CN=Administrative Groups,CN=Exchange Administrative Group (FYDIBOHF23SPDLT) ,CN=Databases,CN=<DatabaseName>
3. Please reboot the Exchange server.
Best Regards.