Yeah... You definitely stumbled upon something ugly in our flow here. We are investigating now what got "confused" on our back end. Long story short, there is some, ummmmm "plumbing" underneath that helps tie together access to the sandboxes etc. when you get an account. I've asked David Roe to take a look at this and get this fixed. In the meantime, I'm more than happy to take any manual steps necessary to get you up and running.
This is definitely not the user experience we want & I apologize for any inconvenience this has caused.
We've looked into these issues and would like to schedule time with you to perform a screen share to understand exactly how you navigated to the destinations you describe. I will send you a meeting invite so that we can delve in and get to the bottom of this.
Guys, thanks for responding so promptly and getting this resolved. It looks like we're all set.