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I try to login via SMS because my phone was reset and now I am getting:
Error 399287 means Azure has blocked your phone number for SMS verification due to a “bad reputation” flag.
How to let the flag be removed?
A Microsoft app for iOS and Android devices that enables authentication with two-factor verification, phone sign-in, and code generation
The Microsoft Data team has reset my MFA and solved the issue.
This answer has been deleted due to a violation of our Code of Conduct. The answer was manually reported or identified through automated detection before action was taken. Please refer to our Code of Conduct for more information.
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