Hi Tenacious,
I have a Victorian TAB account. Just like Wunfluova mentioned, there are 2 numbers, a 6 digit account number, and a 7 digit customer number, both of which are shown on your account card. I'm guessing you don't have your card yet. The 7 digit customer number is what you need to log into your internet account. If I remember correctly, the lady down at the TAB mentioned that the customer number is the same as the account number, only with either a 0 or 5 tacked on the end of it. So, try entering your 6 digit account number plus either 0 or 5 at the end. Hope this helps.
Have a good one,
Silver