If you are creating a new service account and the app is already installed on the domain, you have to reauthorize the new credentials.
Procedure
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Log on to Google Could Administrator portal (https://admin.google.com) using your super administrator account.
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From the navigation menu, go to Apps > Google Workspace Marketplace apps >Apps list, and then select the installed marketplace app.
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If the Data Access status is Partially granted, click Grant access.
The status will be updated as Granted.