Charles Schwab - Passkeys work in Chrome, not in Safari

Charles Schwab has recently added passkey support.  

I’ve added a passkey successfully using Chrome on a Mac.  I can use this successfully to sign in on the same Chrome browser.

When I try to login to Schwab using Safari, 1Password acts like Passkey exists.  I’ve tried it with full MacOS integration and without.  Under the “full integration”, it says “no matching items”.