In order to start using a shared audience, you will need to accept the Terms of Service for each audience in each of your accounts.
If you requesting multiple Facebook Custom Audiences, you will need to accept the Terms of Service for each audience in each of your accounts:
For Personal Facebook Ad Account, Click here to navigate to the Custom Audiences Terms > Then click the Account dropdown on the top left to select the Ad Account, and click the "Accept" button.
For Business Manager Account, Click here to go to the Business Manager Facebook Custom Audiences Terms of Service page to accept Terms of Service.
If you need assistance along the way, please feel free to message us within the app or send an email to help@growth-x.com.
Happy Growing!
The Growth-X Team