I do not have admin rights on a customer system.
On this system I'm just a developer.
we built a new group of developers called "Role Editor" and gave them all rights for Metabox (so I hope).
I see the menu structure.
But when I want to open CPT it tells me I have no rights to do so.
What do I have to do to continue working with Metabox?
If you are not an administrator user, you need to have the right capabilities to access the CPT of Meta Box to create field groups, post types, taxonomies, views ...
See this screenshot https://imgur.com/eMDtzdv
Can you please share some screenshots of the capabilities for the custom role? Or you can try to contact User Role Editor support to get more information.
i got mail support from Vladimir Garagulia the devop from User Role Editor.
As shown at the screenshot below, Meta Box uses 'activate_plugins' capability to protects its top admin menu items. Role entwickler has full access to the Meta Box menu after I grant it to this role."