Can't sign in to microsoft because I don't have a passkey for the authenticator app.

If this is a work or school account, there is no self-service bypass if the only allowed method is Microsoft Authenticator/passkey and no other sign-in method is available.

Try these in order:

1. On the sign-in screen, select Other ways to sign in or Sign in another way.
2. If Approve a request on my Microsoft Authenticator app is available, use it:
   • Enter the username and select Next.
   • Select Send notification.
   • Open Authenticator on the mobile device.
   • If shown, enter or tap the matching number, then Approve.
3. If the app shows You haven't finished yet, add the account directly in Microsoft Authenticator:
   • Open Authenticator.
   • Select + Add account.
   • Choose the account type.
   • Select Sign in with Microsoft and complete verification.
4. If the passkey was on an old or different device, set up a new passkey after signing in with any alternative offered. If a passkey is no longer valid, select another sign-in method, then remove old passkeys that no longer apply.
5. If this is an Android Work profile and the passkey was created in the Personal profile, recreate the passkey in the Work profile.
6. If no alternative method appears and Authenticator/passkey is the only option, contact the organization’s IT admin and ask them to issue a Temporary Access Pass (TAP) or reset MFA methods and require re-registration.

For a personal Microsoft account, if the passkey is missing or invalid:

• Try another offered sign-in method.
• Set up a new passkey.
• Delete old passkeys that no longer apply.
• If the QR code for mobile sign-in does not appear, make sure Bluetooth is enabled on both devices, both devices are in range, and both are connected to the internet.
• If still blocked, use the Sign-in helper or Contact Support options in Microsoft Support.

References:

• Sign in using Microsoft Authenticator
• Error message "You haven't finished yet" with passwordless sign-in
• Troubleshoot signing in with a passkey
• Enable passkeys in Authenticator
• Microsoft to stop sending SMS codes for personal accounts