HBO GO and MAX GO profile

I have an HBO go username and password.  I am attempting to sign into MAX go.

"Your GO profile is shared between HBO GO & Max GO.  Any changes will apply to both services"

When I try to sign into the MAX GO site it takes me to "Complete your MAX GO sign up".

I am being asked to "complete my MAX Go sign up"...not sign in.

When i type in my username (the one shared with HBO go) it gives me this error:

"This MAX GO ID is taken. Please create another."

I cannot get past sign up page and have had NO luck getting any answers.