After several attempts, the email invite comes through, but that's not the end of the problems. 

Accountant side, we accept the invite and link it to the appropriate login. We've done this with 30 other companies, so we know it works. 

Then we get a screen that says "Select Company" and we see our company and "Company not shown" as the options )or something to that effect. Select EITHER option, and *NOTHING* Happens.  Asked client to remove invitation and try again.

When the connection WORKS, clicking this screen on the name of our company results in some "sparkle graphics" on the screen, and then it connects. If we DON'T SEE THE SPARKLES, then we know the connection did not work.  The "No sparkles" happens way too often, and the current client I cannot connect at all. 

Any ideas on how to fix?