When you have received the [The publishing group] cannot be added because one or more organizations already have access through an existing Publishing Group. error message and need to find the organizations that have access to the Course, you can use the Find Publishing Groups search page.
Find Publishing Group
On the Admin menu in the Courses group, select Publishing Groups. This will bring up the Find Publishing Groups search page.
Select the Add filter dropdown.
Select the Course (Choose) filter.
In the Choose Course dialog, search for and select the course and select OK.
Select Search. The search results will list the all the publishing groups that contain that course.
Next to each publishing group, select Details to the right of it to open the Publishing Group profile page.
Under the Published Organizations section, review the organizations who have access to the course through that publishing group.
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For more information on Publishing Groups, please see: