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Possible reasons and solutions:
- if you have changed device in case of device change or application/plugin change for OTP tokens
- Solution - go back to login screen and reset OTP token from there - OTPtokenresetorenable
- date/time could be out of sync on your the device where you are generating one time codes
- Solution - make sure device or application/plugin has time in sync
- Google Authenticator - tap on hamburger menu (⋮) in the top right corner > Settings > Time correction for codes > Sync now.
- Solution - make sure device or application/plugin has time in sync
- even if OTP does not work after time sync
- Solution - go back to login screen and reset OTP token from there - OTPtokenresetorenable