The “400 admin_policy_enforced” error occurs when your Google Workspace administrator has set a policy that blocks access to Shared Contacts Manager because it’s a third-party app.

How to fix the 400 admin_policy_enforced error:

This error cannot be resolved by users directly, as it’s caused by policies set at the administrator level. If you see this error when trying to access Shared Contacts Manager, contact your Google Workspace admin for assistance.

For Google Workspace administrators:

If your users encounter the “400 admin_policy_enforced” error, it likely means that third-party app access is restricted. Follow these steps to resolve the issue:

1. Go to the Google Admin Console.

2. Under Security, select API Controls.

3. Search for Shared Contacts Manager.

4. In the Access to Google data section, check if it’s Blocked.

5. If it is, change the setting to Trusted and save the changes.

Alternative cause: Blocked Google service

This error can also occur if a Google service is blocked for a user. To check:

1. Go to the Google Admin Console.

2. Navigate to Apps > Google Workspace.

3. Select the service causing the issue.

4. Ensure the service is turned On for the user’s Organizational Unit (OU). If it’s Off, switch it to On to restore access.