I've created a new user in the Dynamics 365 environment as I've done countless times before. I assigned the user a Dynamics 365 Sales Enterprise License.
But when the user tries to log in, they get the error " Not Supported - This action is not supported". It gives the option to show details. I've attached screenshots of both.
I've checked roles and security settings. I've compared with users that are functioning. I've deleted and recreated the user. I've tried logging the user in from different computers. Nothing works. 
