HI,
My tenant updated to D365 this evening and since getting the successful email I have not been able to log in. Just getting a white page with a message saying:
"An error has occurred.
Try this action again. If the problem continues, check the Microsoft Dynamics 365 Community for solutions or contact your organization's Microsoft Dynamics 365 Administrator. Finally, you can contact Microsoft Support."
Any thoughts before I try to get Microsoft support to respond to me...?