[agr]

Just set accurate time in your phone and pc (if it not autosynchronised to ntp)
I mean if your pc time 11:30:45 for example, but on phone time 11:30:00 - then you will get autentification error
From wikipedia about autentifiactor:
Technical description
During setup, the service provider generates an 80-bit secret key for each user (whereas RFC 4226 §4 requires 128 bits and recommends 160 bits).[8] This is transferred to the Authenticator app as a 16, 26 or 32 character base32 string, or as a QR code.
Subsequently, when the user opens the Authenticator app, it calculates an HMAC-SHA1 hash value using this secret key. The message can be:
the number of 30-second periods since the Unix epoch (TOTP); or
a counter that is incremented with each new code (HOTP).
A portion of the HMAC is extracted and displayed to the user as a six digit code.