Since that panel is on the “Tools” page, I have tried giving the role the “manage_options” permission, but the WordPress “Tools” window does not appear.
What permissions should I give to the Role for that option to appear and be able to modify the options?
Right, Redirection plugin itself requires ‘manage_options’ capability. But “Tools” menu is protected by ‘edit_posts’. Add ‘edit_posts’ capability to your role and “Tools” menu will appear with “Redirection” and some other submenu items together.
I have tried adding both permissions at the same time and it didn’t work, I even created a new role to test and I don’t get the options, could you tell me if I need to add/remove any more permissions?
My test role contains just 3 capabilities: read, edit_posts, manage_options
and such user sees Tools->Redirection menu item.
What if you deactivate all plugins except redirection? Will it become available?
Thanks for the note about PHP warnings. I fixed the problem.