Note : You must have Admin Access to invite other users or partners.
How to Give access of your Facebook Business Manager Ad Account
As your business grows and ad spend increases you’ll most likely need to add additional users, partners or a digital marketing agency to help you manage all your assets and advertising campaigns. Let us show you how to give Complete Access of Ad Account to any partner.
Choose the page and its ad account.
Click on ‘Assign Partner’.
In the pop-up dialogue box, click on the link ‘Connect your ad account using your partner’s business ID instead
thee will be different types of roles available but give us complete Ad account admin Access