How do I authenticate accounts with the Microsoft Authenticator App?

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I previously had Microsoft Authenticator on my previous devices. I have just been released to log into my acct. after 30 day freeze on security info updating. I am trying to log into my accts. (FB, SnapChat, Google Accts, OneDrive, Outlook ect...) and I am NOT understanding HOW to sign into my acct, AND get it authorized by my microsoft authenticator app? HOW do I enter them correctly so I get codes that need to be entered? Then, what is the security key (password???) for when I have to manually enter accts. because I cannot scan QR codes? I'm so sorry if this is confusing, but I hope someone understands my dilemma & can help me out here. ~~Thank you🧸💕

Microsoft Authenticator
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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