Thanks for getting in touch here. I'm sorry for the delay in getting a response back to you. I have run this past various developers and team members, it looks like our help may be limited here currently. As Azure Stack is quite new and quite complex, we do not currently have the infrastructure in place be able to internally develop/test any kind of consistent fix. This means we can not be certain what would work to resolve your issue. It is possible that some calamari code changes could help so we are going to look a bit deeper into this avenue.
We are going to continue keeping an eye on any reports of issues with Azure Stack and investigating. However, currently its not something our developers are able to fix.
I am sorry again for the delay in responding to you and for the complete lack of help I was able to provide in my response.
Thanks for the feedback. I understand it is not easy to test and develop against. I have managed to work around it for now, just cannot use the "Azure Resource Group" deployment step, since it always fails with same error as I get when trying to verify account.
If it at least was possible to specify the graph uri in Azure account setup I think that could help solve this. If you need any help verifying fix I'll gladly help as we do have a running Azure Stack now.