Log in to https://admin.google.com/, and then navigate to Devices > Chrome > Apps & extensions > Users & browsers.

In the bottom right, select the plus (+) icon in the yellow circle and select Add Chrome app or extension by ID.

Type the value gpkcimdiphdhnenbncknfiakplflhmnc and then select SAVE.

Navigate back to the Google Workspace admin console at https://admin.google.com/ and select Security.

Scroll down and open API controls.

Select MANAGE THIRD-PARTY APP ACCESS.

In the section Connected apps, hover over Expel for Phishing and select Change access.

Choose Trusted: Can access all Google services and then select SAVE. The Expel Managed Phishing app is now listed as Trusted in the Connected apps view.

Go back to the Admin console and select Security.

Scroll down and open API controls.

Select MANAGE DOMAIN WIDE DELEGATION.

Select Add new.

Enter the following for the Client ID and the OAuth Scopes:

Select Authorize.