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 on meta)
#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 with security key
*Go to en.wiki in same browser tab
*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, symmetrical: 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.