Hi @1941peter,
We'd recommend that you check the welcome email we have sent as that's where you can double check if the account username/customer ID you're using is correct.
Once you've confirmed the details, you can reset your TPG My Account password and this article will guide you: Forgot your TPG account password?
We have also created this community article that may help you in Using TPG My Account & Online Account Info
Let us now if we can be of further assistance.
