For selected mailboxes this error seems to appear when selecting the Permissions tab.
I am not sure what is the difference between this user and the others that work. The powershell URL is https and is a local URL based on the recommended specifications.
Does anyone know why?
From the error i would expect that this user / username (upn or sam) has changed in Exchange/active directory but not in SolidCP
Normally i would either change it back to what solidcp expects and then change it via solidcp, or alternatively change the values in ExchangeAccount database table to match active directory.