Yubi key blocks MS Teams on my iphone 16 pro max

Dear Sean Pardon,

I understand that you are unable to access Microsoft Teams on your iPhone after setting up your YubiKey.

This may be related to the authentication method or security policy applied to your Microsoft account rather than Teams itself. For example, your organization may require YubiKey/FIDO2 authentication, or the authentication process may not be completing successfully on the iPhone.

First, please try the following:

1. Update iOS, Microsoft Teams, and Microsoft Authenticator to the latest available versions.
2. Try signing in to Teams again and check whether Sign-in options or Other ways to sign in is available.
3. As an additional troubleshooting step, please try using Google Chrome instead of Safari when completing the YubiKey setup and check whether the passkey registration can be completed successfully.
4. Restart Teams on your iPhone and try signing in again.

For more reference: Passkey (FIDO2) authentication matrix with Microsoft Entra ID

If the issue persists, please provide the exact error message, your iOS version, and the YubiKey model you are using.

Please try the troubleshooting steps above and let me know how it goes. Thank you very much for your valuable time and your cooperation.