Office 365: Your sign-in was blocked

Situation: When attempting to login Office 365, you may receive this message: “Your sign-in was blocked”.

Troubleshooting:

1. Login Azure portal.
2. Go to Azure Active Directory.

3. Click Security on the left pane.

4. Click on Multifactor authentication.

5. Click on Block/Unlock users.

6. Highlight the user who is blocked and click on Unlock.

Also refer to these posts:

Fixing “Your organization doesn’t allow you to update your password on this site”

Fixing “Your sign in was successful but does not meet the criteria to access this resource”