Firefox extension on steamdeck insists on physical-key for first-time auth, no option for 2fa-code

Somehow my Yubikey doesn't work correctly on that device, so I am dependant to login via 2fa-code. There seems to be no option for it in Firefox. Is there a workaround?

---

1Password Version: Not Provided
Extension Version: Not Provided
OS Version: Not Provided
Browser: Not Provided