Cannot view partner.myob "you are forbidden to access this resource"

I'm trying to set up some new users to our practice, I've added them to a couple of clients. They can view the client files through https://app.myob.com/#/businesses but if they try to view through 

https://partner.myob.com  theg get an error saying "sorry but it looks like you are forbidden to access this resource"

We've tried all the basics, logging out and back in, opening in incognitio mode etc.