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[SOLVED] Your Sign-In Was Blocked. We’ve Detected Something Unusual Activity

Today I’m going to show you how to solve your sign-in was blocked in Microsoft 365 teams. I saw the error recently where one of my users was trying to access a channel on Teams which has been sent by a client but unfortunately the user received the sign-in attempt was blocked error.

Your sign-in was blocked. We've detected something unusual activity

The user was able to access internal channels and other stuff without any issues but for some reason, the error (Your sign-in was blocked and we’ve detected something unusual activity) got triggered when they try to access an external channel.

I was not able to resolve the issue since the error new to me and couldn’t find appropriate steps to get rid of the error. I thought to enable the Multi Factor Authentication on the affected user account because of the error code reported in the Azure portal.

If you have an error code (For example, 53004), you can use this link to understand the failure reason.

microsoft 365 teams

But, I wanted to try something else before enabling MFA on the user account. I looked at risky users in Azure portal to check the user account status because they handle sign-in activities so I thought this might be related to the issue.

  • Go to “Azure Active Directory”
  • Select “Security”
  • Select “Risky users”
ms teams app

The user account was listed and there was an old unaddressed risky sign-in event and once I dismissed them the sign-in attempt was blocked error disappeared. The MFA registration isn’t done.

Now I’d like to hear from you:

Did I miss anything or maybe you have a question about something that I covered.. Either way, let me know by leaving a comment below right now.

Want to improve your Microsoft 365 Teams experience for better productivity? Check out the tips and tricks mentioned here.

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