User:Bri.public/2FA issue

Issue with 2FA: Phab:T244088, "Logging in at another wiki than WebAuth was set up fails"

Summary: 2FA login with WebAuthn only works on the wiki where the security key was registered

Configuration:

YubiKey 5 with PIN enabled
Google Chrome 110.0.5481.104
Windows 10

Repro steps

Request oauth-enable perms on meta - ok (Special:Diff/24594457)
Go to Special:Manage Two-factor authentication on meta
Enable 2FA and enroll Yubikey on meta - ok
Log in on meta, default login options - ok
Log out of meta
Go to en.wiki and click log in with username/password; offer key PIN and touch Yubi

Expected vs actual result:

Expected result: Logged in to enwiki
Actual result: Not logged in, Yubikey not recognized: Windows Security dialog says "This security key doesn't look familiar. Please try another one."

Workaround:

Log out on meta
Log in on meta
Go to en.wiki
Click Log in on en.wiki: username/password login page briefly appears and then redirected to main page as logged in without any further action
- Note after this login, I can go to special:Preferences, click Manage 2FA, and the wiki seems to know that WebAuthn is enabled, and the security key with the nickname I gave it in step 3 is listed as a registered key, even though I can not log in with it.

Note: I disabled 2FA and re-enrolled the security key on en.wiki and repeated the process of logging in on the other wiki. Same results, that is, I could only log in to en.wiki with the security key but could click "log in" on meta once I was logged in on en.wiki.