I'm using sn instances and usually with TOTP (authenticator app).
For other services I've got hardware security key in place and using it without any issue.
Tried to set-up the same for sn was causing issue and displaying some pop-up:
Error: Invalid 'sameOriginWithAncestors' value"
It was a case for dev, prod sn instances but also the same for pdi.
After few attempts I gave up.
Edit #1:
It occurs that Bitwarden was inserting some iframe that prevent logic to works properly.
As a workaround you can add exception for domain serivce-now.com - it allows to still use Password manager to server user/pass and register/use Hardware security key
