Agencies' access settings can be managed on the [Ad Channel Integration]>[Meta Ads]>[Agency Settings] page.

Google Ads Manager Account

When working with multiple agencies, the best practice is to create a manager account (MCC) and link the agencies' ad accounts for easier management.

For more details, refer to this article from Google Ads.

Admins and Managers can view the agencies that can access the Google Ads campaign data on the [Agency Settings] page.

• Agency Settings

Admins and Managers must configure agencies' app access settings on the [Organization]>[Agency] page so that agencies can access the Google Ads campaign data and integration settings.

• Agency App Access Settings