I've tested this several times now with the same results so I'm pretty sure this is what's happening.

I set up an email account to use a Passkey on my phone to authenticate me. When I first set it up, it worked fine. After that, it fails (the notification comes to the phone, but it times out with a "Cannot connect" error even though the phone and PC are beside each other and I have verified a live Bluetooth connection.

I've found that if I unpair the phone from the PC, then repair it, the Passkey authentication works again - but only once, then subsequent attempts fail. I can unpair/repair and it again works, but just one time.

Any idea how I can troubleshoot and resolve this?

Using Ubuntu 22.04 LTS, Android phone (Pixel).

Thank you.