Are you also using HealthEquity for your HSA? I'm the same boat, they're forcing passkeys on me. I can still login using my employer's SSO but I've been putting off setting up the passkey until I have to.
I've refused to set up an account. I just call them on the phone if I need something special from them, have them send paper statements, and eat the should-be-totally-illegal-because-of-how-obscenely-large-it-is "mail you a paper statement" fee.