I'm having the same issue. Somehow my team subscription "magically" was cancelled today. I keep looping through "your creative cloud membership expired" and "Success: your membership is good". AAARRGGHHHH!!!!
Please be sure that you are using the correct Adobe ID to login.
Please refer to the help document below to fix the trial error:
You may also try to check your host file for any Adobe blocked entries.
In case there are any blocked Adobe entries, please delete them and then save the file.
My workaround is to create a new email address for everyone and inviting the new email address.
But I'm not able to remove the license or duplicate users from the creative cloud management website.
My host file isn't modified. Do you have firewall port requirements?
When I call, support said this is a known issue for many people. Please publicly acknowledge this issue and update http://status.adobe.com/