This usually happens after installing a WGT app update. To reload previous app permissions, please close the WGT app (remove it from the list of apps running in the background) then launch the Phigolf app.
On the Phigolf app, click the Play WGT button to launch the WGT app. This will transfer the subscription information to the WGT app and you will be able to regain access to all the courses.
Note: Make sure to do this too in case of complete uninstallation/reinstallation of the WGT app.