The most common reason for the "Invalid token" error while logging in, is 2FA feature does not recognize your 6-digit code from Google Authenticator app, because the time on your computer is not exactly the same as on your phone. If there is a more than a 30-second difference (the code in the authenticator app is generated every 30 seconds), 2FA feature will not recognize the entered code as the correct one.
Please, go to "Time and date settings" on your phone and check that the time is set to "Automatic". When both times are synchronized, your 6-digit code from the authenticator app should be accepted by Blocktrade 2FA feature.
⚠️If this does not solve the problem, please, contact our Support team.