If your account has two-step verification, signing in with the correct password or Google account may still require another check. Open your configured authenticator or use the verified factor offered on the screen.
If your usual factor is unavailable, use the recovery option already offered for your account. Recovery codes are private credentials: enter one only in the recovery form. Do not paste one into KAI or a support request.
Account help can explain the published recovery steps. It cannot bypass verification, remove a factor simply because someone knows an email address, or grant business access. If a connection expires while you complete verification, return to the original service and start sign-in again.