Hi Peng, Thank you for reaching out. It seems that your client account does not have the Billing Setup. You could navigate to TOOLS & SETTINGS -> BILLING -> Billing Setups to check it. It needs to show a Paying Manager in order to work properly. You do have consolidated invoices in the MCC account. However, your client account does not seem to be attached to the consolidated billing that was set up. You would need to talk to a billing account specialist to get it properly set up. You could find the link on this Help Center article.
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