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When an invitation is accepted, the owners of the profile are notified through email. All users in the account can view the names and email addresses of the owners and managers of the profile.
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Facebook - Adding Users
Log into the email associated with your personal Facebook account.
Open your Business Page.
From the left menu, select Settings.
Select New Pages Experience.
You will find the request under Partner Request or Ownership Requests. Select Respond to request.
Select Give CCI Marketing Service access to my PageFind the mail from Facebook <notification@facebookmail.com>
Click the Review Request in Business Manager button.
Approve the access request from CCI Marketing Service.