Setting up A GSX User
Use an existing, or create a new, Apple ID at https://appleid.apple.com. Using the same credentials as your AST Server means the passwords can be updated in both systems at the same time.
Confirm that this AppleID can login to your GSX Account at https://gsx.apple.com.
Click Settings at the top. Click Permissions.
Confirm "My Privileges" can “Access Web Services”.