For some reason none of these versions (screen provided) works correctly:
The mod itself is recognised by game, even able to set key bind to open configurations.
But the key bind doesn't open anything (no matter which key bind is set) so ultimately the whole mod doen't work.

Have seen a few same issues in the comment section here: https://www.curseforge.com/minecraft/mc-mods/configured/comments
Thank you for the solution in advance!

By the way, JEI also doen't react on the presence of Configured: using the config button on the JEI interface while having Congfigured installed still does nothing but writes "Install Configured to config JEI in-game".