→ Open Facebook Business manager https://business.facebook.com
→ Click on “Business Settings” button that is on the top right
→ On the next step click on top left “People” under “Users” as shown below, and Click on +Add Button.
→ It will open a new pop up window as show below, type/paste my email id and select as admin.
Click on “Next Button”
→ On the next window give the access to all the assets such as Pages, Ad accounts, Catalogues and click the Invite button.