Sometimes Microsoft forces you to enable security authentication login for your office 365 account.

You must download an Authenticator software to help you log in.

At first, I thought it was the result of Azure multiple authentication that was off. It's useless!!

resolvent:

 1. Open the management background. 2. Click Azure Active Directory 3. Click Azure Active Directory in Azure again 4. Click: Properties 5. Click below: Manage Security Defaults 6. Modify the security default value to No (choose any reason)

Generally, the problem can be solved

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