API Access Disabled for Google Workspace (G Suite) Domain
Follow these steps to resolve issues with Google API access:
Step 1: Sign in to the Google Admin console using an administrator account with the required Service Settings privilege.

Step 2: Go to Security > Access and data control > API controls
Step 3: Once the 'API controls' page opens, under the 'App access control' section click on 'MANAGE GOOGLE SERVICES'.
Step 4: From the Google services list, select the services that SysCloud is backing up, such as Gmail, Google Drive, Calendar, Contacts, or other required services. Check the Access status for the selected services. If a required service is marked as Restricted, select the service and click Change access.
Then select the radio button 'Unrestricted' and confirm by clicking on 'Change' button.
Step 5: Return to SysCloud and retry backup.
Related article: 🔗Control which third-party & internal apps access G Suite data