You can create new authorizations in the Authorizations page of the Email Security - Cloud Web portal.
To add a new authorization:
In the Authorizations page, click Add Authorization.
Next to Platform, click Select and choose MS365 Commercial, Google Workspace, or MS365 GCC High.
For MS365 Commercial, select Client Secret or Certificate from the Authentication Method drop-down.
The authentication method cannot be changed once the policy is created. To switch between authentication methods, you must change the selected authorization policy in the remediation policy for the domain.
Enter the authorization name and description (optional).
Click Create.
Your new authorization is unauthorized to take action in O365 or Gmail and is not yet assigned to a remediation policy.