After you've linked the Service Account to your Workspace and copied the Unique ID, you'll need to add the Service Account as an OAuth App.
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Access your Workspace, and navigate to Security >Access and data control > API Controls, and select MANAGE THIRD-PARTY APP ACCESS.
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Select Add app > OAuth App Name or Client ID.
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In the window that opens, you'll be prompted to enter an OAuth app name or client ID. Go to APIs & Services > Credentials to locate the Client ID, and copy it.
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Paste the Client ID and then select Search.
Next, you'll need to add the Service Account as a Domain-Wide Delegated App.