Cannot start Microsoft Learn exercise

Georgi Pehlev 21 Reputation points

I recently added an .com email as a secondary email to my Microsoft account. A few days after that, I tried signing into Microsoft Learn to continue studying for an exam challenge I signed up for through my company. Now I get an error '<my_primary_email>@Stuff .com is already a Microsoft account. Please try a different email address' upon attempting to review permissions for the sandbox in order to perform an exercise from a Microsoft Learn module. When I click Next, I get another error: 'Someone already has this email address. Try another name or claim one of these that's available' and it suggests that I use another .com address. Up until this point, I never used an .com email to sign into Microsoft Learn.
I tried removing <my_secondary_email> .com as my secondary email from I opened Microsoft Learn in an incognito window. I also tried to open it from another device. I always get the same error. I have 2FA enabled and when I get a prompt to verify my account during sign-in, the prompt is for the correct account - I use <my_primary_email>@Stuff .com to sign into Microsoft services.
I suspect that the Microsoft Learn sandbox invited my .com account to the Microsoft Learn Azure AD tenant.

Microsoft Entra ID
Microsoft Entra ID
A Microsoft Entra identity service that provides identity management and access control capabilities. Replaces Azure Active Directory.
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  1. JamesTran-MSFT 36,046 Reputation points Microsoft Employee

    @Georgi Pehlev
    Thank you for your post!
    Microsoft Learning/Exams are currently not supported here on the Q&A forums, our Microsoft Learning/Exam experts are actively answering questions in dedicated forums here:

    Thank you for your time and patience throughout this issue.


    Please remember to "Accept Answer" if any answer/reply helped, so that others in the community facing similar issues can easily find the solution.

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  1. Georgi Pehlev 21 Reputation points

    Hi James. Thank you for pointing me to the correct community!

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