Premier Pro Teams won't open any project

We have 2 separate edit suites using 2 different team accounts. 

Yesterday both machines stopped allowing us access to any of the teams projects.

We can access the list of porjects to select but now it will just bounce us back to the opening home screen.

We are experienced production house and have been using teams for the last 5 years.

We have tried all the usual - options REBOOT / RE_INSTALL / CLEAR CACHES etc but no avail.

We can create new team projects and then import an auto save file which seems a really longwinded thing to do and doesn't solve the issue that then might reoccur.

Also currently it would let us invite other collabortors to see if they can open the project files.

Its almost as if it can't communicate with the cloud but our internet / netwrok is working fine. 

Servers have been rebooted etc.

Any thoughts from anyone.

Thanks