Adprep detected that the supplied or default user is not a member of the following groups: Enterprise Admins group. Status/Consequence ...

Adprep detected that the supplied or default user is not a member of the following groups: Enterprise Admins group.
[Status/Consequence]
Adprep has stopped without making changes.
[User Action]
Verify the user is a member of Enterprise Admins group and Schema Admins group.