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Tutorial｜How to Connect to Google Ads?

  • Updated

    By connecting Google Ads in the Admin Center, you can link your brand’s Google Ads account with the Crescendo Lab platform, serving as the foundation for subsequent MAAC segment synchronization and advertising applications.

    This article explains the preparations required before connecting Google Ads, as well as the actual setup process in the Admin Center.

     

    # Create a Google Ads Manager Account (MCC)

    Before connecting Google Ads in the Admin Center, you must first complete the creation and setup of a Google Ads Manager Account (MCC).

    An MCC allows you to centrally manage multiple Google Ads accounts and is a required prerequisite for connection and authorization.

    If you already have a Google Ads Manager Account (MCC), you can skip this step and proceed directly to “ 2. Authorize Crescendo Lab Service Account to Access the MCC ” without creating a new one.

     

    1. Create and Link a Google Ads Manager Account (MCC)

    • Sign in to Google Ads Manager Account

      Go to the Google Ads Manager Account creation page → Click “Go to Manager Accounts”

      ⚠️ Make sure to sign in with the Google account that will act as the administrator.

    • Create a Manager Account

      Please fill in the following information:

      ⚠️ These settings cannot be changed after creation. Please double-check before submitting.

      • Account display name: for example, your company name
      • Primary use: select “Manage other people’s accounts”
      • Billing country / Time zone / Currency

     

    • Access the Google Ads Manager Account (MCC)

      After the account is created, you will be automatically redirected to the Google Ads Manager interface.

      Please confirm that the Manager Account ID (format: XXX-XXX-XXXX) is displayed in the upper-right corner and that you have successfully entered the manager account page.

    • Link your Google Ads account to the MCC

      Click “Accounts” → “Sub-account settings” → click “+” → select “Link existing account” → enter the Google Ads account ID to be linked (format: XXXX-XXXX-XXXX) → click Send Request

      After sending the request, the account status will appear as Pending.

      ⚠️ Common failure scenarios include: the ad account is already managed by another manager account, or attempting to link a test account with a production account.

    • Accept the linking request in the ad account

      Log in to the Google Ads account that received the request → go to “Settings” → “Management” → click “Accept” to authorize.

    • Verify that the ad account is successfully linked

      Return to the Google Ads Manager Account (MCC) → go to “Accounts” → “Sub-account settings” and confirm that the linked ad account status is Active.

     

    2. Authorize Crescendo Lab Service Account to Access the MCC

    To ensure proper connection and subsequent usage, please add Crescendo Lab’s Service Account to your Google Ads Manager Account and grant standard access.

    • Log in to the Google Ads Manager Account (MCC)
    • Go to “Settings” → “Access and security” → select the “Security” tab
    • Add the allowed domain based on the information below:
    • Scope: select “This manager account and all accounts it owns”
    • Switch to the “Users” tab → click “+”
    • Enter the Service Account email based on your region:
      • Taiwan, Thailand, Singapore, Hong Kong: harmony-google-ads-production@cresclab.iam.gserviceaccount.com 
      • Japan: harmony-google-ads-production@maac-production.iam.gserviceaccount.com 
    • Select “Standard” for access level → click “Add account”

     

    # Connect Google Ads in the Admin Center

    After completing the Google Ads Manager Account (MCC) setup, you can proceed to connect Google Ads in the Admin Center.

    • Go to the Admin Center “App Center”

      ⚠️ If “Contact us” is displayed, your current plan does not support this feature. Please contact the Crescendo Lab Customer Success team.

    • Select “Connect”

      ⚠️ After connecting, the linked Google Manager Account cannot be modified.

    • Enter your Google Manager Account ID (format: XXXX-XXXX-XXXX)

      ⚠️ Do not enter a single Google Ads account ID.

     

    • Confirm authorization and account status

      ✅ If the connection is successful, the system will automatically list all Google Ads accounts accessible under the manager account.

      ❌ If authorization is incomplete or a Google Ads Manager Account has not been set up, a connection failure message will be displayed.

     

    • If Google Ads accounts are added to or removed from the manager account, you can manually click the “Refresh” button to sync the latest changes.

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