If you see the error message "You haven't finished yet" when setting up passwordless sign-in, it may be because you have other accounts already set up in your Microsoft Authenticator app.
To finish setting up passwordless sign-in, add your account directly to the Microsoft Authenticator app.
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Download and install the Microsoft Authenticator app.
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Select + Add account then choose your account type.
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Select Sign in with Microsoft and enter your username and password.
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Choose your verification method and enter the verification code to complete adding the account in the app.
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Go to Add a new way to sign in or verify and select Use an app.
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Click Get it now but close the new window which opens - you already have the app.
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Select Next and then Finish to complete adding app sign-in to your account.