That “Use passkey from another device” option is basically baked into Chrome’s WebAuthn flow.

The clean fix (this is the one that works consistently):

1. Disable Chrome’s passkey UI via flags

Go here:

chrome://flags

Search for:

  • Passkey
  • WebAuthn

Disable anything like:

  • WebAuthn UI
  • WebAuthn passkey autofill
  • Enable passkey account selection
  • Password manager passkey UI

Set them to Disabled, then restart Chrome.