I have had the same problem for the last 3 years - I've given up with trying to get Intuit to help.  My accountant is not technical, so is no help either.  

You end up going around in circles - 

1. You get an email from the accountant

2. You click the link and log in or create a new account

3. It welcomes you, and tells you to get an invite from your accountant

4. Click the link and send the email to your accountant

5. Go to step 1

At least this year it looks like someone from Intuit is paying attention to the message board, which is new.