Prior to proceeding with the following steps, make sure to choose the project from the top dropdown menu that you had previously selected in Step-1 : Enable Billing Export/ Committed Use Discounts Export or if you have an existing export, locate the project where the export is saved and choose that project from the top dropdown menu.
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Go to IAM
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Click on Grant Access
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Enter service account id under the new principals.(To get the Service account id follow instructions outlined in this page Retrieve the Service Account Id)
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Add Viewer Role
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Click on Save