Microsoft Authenticator
A Microsoft app for iOS and Android devices that enables authentication with two-factor verification, phone sign-in, and code generation.
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In the authenticator app it gives the option of scanning qr code but doesn’t allow me to access screenshots
Then I guess the app don't have permissions to access the camera; you have to grant and how depends which phone & OS & OS version you use; you haven't mentioned that.
Contact the phone manufacturer support.