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So an API key is for an application. It's what the app uses to contact Google and make requests of their service. So your new API key will be used by the application to request access to all of your drives--regardless of the Google account that they are on. The API key isn't the authorization to use a given account. It's just the key that the application uses to request access to the data on whatever account you sign-in with. As an obvious example, Stablebit's default key for CloudDrive was obviously created on their Google account, but you were still using it to access your drives before changing it to your own key right now. When you set it up, you'll see that you still have to sign in and approve your app. It'll even give you a warning, since, unlike actual CloudDrive, Google can't actually vouch for the app requesting access with your key. This just isn't how an API key works. Are you sure you're logging in with the correct account for each drive once you've added the new key? You don't log in with the account you used to create the key. You still log in with whatever credentials you used to create each drive.