Go to business.google.com or just “Google” your business on Chrome.
Click on the three dots (see below).
From the Business Profile Settings click the arrow > next to Managers.
From Managers click on Add (see below).
From the Add manager select owner
Then add in the email address firstname.lastname@example.org
When you see the big 9 pop up, select that suggestion.
Once you and the EMAIL and you have selected OWNER, please click on the Invite button.