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Go to your security info page: https://mysignins.microsoft.com/security-info
Click on “add method”.
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Select "Authenticator app" and click on “ADD”
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Content Comparison
General
Content
Integrations
...
Go to your security info page: https://mysignins.microsoft.com/security-info
Click on “add method”.
...
Select "Authenticator app" and click on “ADD”
...