I just found some time to dig into the problem. It seems that Chase requires only hardware (platform) authenticators, like Windows Hello or Apple Keychain, and is blocking any cross-platform (software) ones. Here is the error I get when Enpass handles the passkeys: That is the authenticator ID of Enpass. I was able to make Chase's passkeys work only with Windows Hello (not Microsoft Password Manager) on my Windows 11 PC. So, bottom line is this is a restriction on the Chase's side and Enpass can't do anything to change it, unfortunately. I have seen this on other sites and it is very annoying.