Suppose you notice that the Microsoft Outlook email client repeatedly prompts for a password when connecting to Microsoft 365 (formerly Office 365) on your Windows 10 device. In that case ...
Microsoft is investigating a known issue randomly triggering "Product Deactivated" errors for customers using Microsoft 365 ...
1] Check if you are a group member Even if you are the creator of the Microsoft 365 group, you need to add yourself to the group. Only when you do that, the group is visible in Outlook.