In cases like this, 99% of the time the issue is caused by being online on your account. Please follow these steps:

1. Switch to Offline Mode: Set your account to offline mode. This should resolve most issues caused by online connectivity.
2. Follow Login Instructions: Carefully follow the login instructions provided to ensure everything is set up correctly.

If the issue persists after switching to offline mode, it is likely related to your computer. Keep in mind that if the account you were provided has access to the game, the issue is usually not account-related.