Error 500 when trying to create a new User Mailbox

Question

Hi all,

Sorry if this was already answered. I tried to search it but wasn't able to find anything.

So, my issue is that I can login to ECP, move databases, edit users, DAGs etc.

But, when I try to create a New User Mailbox the popup gives me an error 500 message:

I have three Exchange Servers and this is happening to all my servers even when accessing them directly by localhost.

Can anyone give a road to follow? As the whole rest of ECP is working properly...

Thanks!

Posted Nov 3, 2025, 9:13 PM UTC