Enable Users Sign-In for Office 365 Exchange Online Enterprise Application
If you receive the following error message within the portal:
Error: The service principal for resource 'https://outlook.office365.com' disabled
All you need to do is to enable users sign-in for your Office 365 Enterprise Online application as follows:
- Login to your Azure AD Portal / Microsoft Entra ID
- Open "Enterprise Applications" in Portal
2. Search for "Office 365 Exchange Online"
3. Open "Properties" and set "Enabled for users to sign-in?" to "Yes"
4. Don't forget to click "Save"