I get this error all the time working for a government institution,
The administrators haven't given permissions for you to add, modify or delete anything in their "Environments".
there's probably a checkbox on your account to even be able to set up a trail environment that i don't have access to either.
It kind of sucks, unless you know an administrator that can give you permissions. Until then we either have to pay for our own business account with Microsoft, or not participate in the early launch
Thats what i think it is anyways.. sorry