Problems setting up Passkey for Developer Tier

I’m having problems setting up my Passkey for Developer Tier. Specifically, I am trying to save the passkey to my phone and I am getting the error:

The authenticator used to register the passkey is not allowed

What can I do?

Please ensure you are using one of our Recommened Passkey Types. We have found these to be by far the smoothest.

Also ensure your OS and browser are up to date.