Hi, It sounds like each client has their own authentication with you GCP project. They can log in directly to their accounts without your login customer Id because they are probably authenticating with a Google Account that is already a user in their Ads accounts. You probably are a user in your mcc account, if that is the case you can log in with login customer Id set to your mcc account and access your client's account. Some setups don't even need an mcc account altogether. For more information you can look at our login customer Id guide.
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