Generally, it occurs due to time on the device which is being out of sync.
Check your phone settings and make sure that the time set precise to the second or check whether your device is synced with a time server.
You can follow the steps given in this link to re-sync:
Another possible reason is going to a wrong website, Google Authenticator allows you to manage many different 2FA tokens.
You need to pay more attention so that you use the correct token.
The tokens will expire soon. Therefore, enter the token quickly so that it doesn’t expire. And, also make sure that it is the right one.
If you any further problem and need assistance, you can submit a request to contact support found in the top right corner of the website.