External Modules dont show if logged in as regular User despite full rights

Hello,
I have recently purchased and installed two external modules. With an admin user everything works, but when I am logged in with a user the modules do not appear in the navigation bar, despite having full rights.

Am I doing something wrong here?

Please help!

With kind regards
Severin Schleps

These are the modules:

Hello,
have you tried to see the permissions of non-admin users?