When we use Google Authenticator to login, the Pin-Code ist only valid 10 seconds after a new code is generated. If we wait longer to enter it (even if it should be okay for 30 seconds) Seems like some timing error. Took us some time to find this one... we first just always needed to enter the code 2-4 times. Until we found out, when we just enter it when a new one is generated, it always works.
Best regards.
Patrick
Best regards.
Patrick