In the below guide we show you how to locate your Google Ads 10 Digit Account ID Number. You will need this number if you are going to work with an agency as they will add your account to their Google Ads Agency (MCC) account so their team can access your account.
After you provide your account ID number to your partner agency, they will send a request from their agency account to you to approve. All the admins of the ad account will receive this notification for requested access. Any admin on the ad account can approve it.