passkeys in the Authenticator app regarding attestation

I have a question about passkeys in the Authenticator app regarding attestation in connection with QR code-based cross-device sign-in.

When we register a passkey with attestation enabled in the Authenticator app, it can be used to complete the sign-in process on another device via QR code and Bluetooth Low Energy. According to Microsoft’s documentation, this shouldn’t be possible with attestation enabled, yet it works. What are we misunderstanding here?

https://learn.microsoft.com/en-us/entra/identity/authentication/how-to-enable-authenticator-passkey

Thanks for your inputs.

Johannes