Correct credentials and 2FA but cannot login

Hi, as explained in the title, I often face the issue.
I am using Google Authenticator.

"The information you have entered is not valid. Please check the spelling of the account name and password." etc.

One way to overcome the issue is to disable the 2FA in-game and then re-enable it.
But I wonder what causes it, and how I can avoid this problem without disabling 2FA.

Any suggestions?

Website login works as expected.

I do play behind a VPN.

This seems to happen every day, since recently.

The only way I have to login in-game, is to login into the website, security settings, disable "in-game 2FA", login in-game and then re-enable "in-game 2FA" to keep the account secure.

Any clues?