First Deactivate all plugins or code used to modify the roles.
Under the Super Admin -> Users menu, find the user you wish to promote. Hover over their username and a small “edit” link will appear beneath it. Click it. This will lead you to the user’s profile page.
Scroll down to the “Name” section, you will see the checkbox selected to make this user a Super Admin on your site. Hit the update button to save the chage, and the user now has access to the Super Admin menu.
Check if the user now can manage themes, if ok, activate the plugins or code and this time block or remove the functions that you don’t wish to give access to that user.
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