Arduino UNO R4 Minima - I can send keystrokes, or I can control a stepper motor. But I can't do both things in the same sketch

Hi @Delta_G ,
I'm very obviously in search of a solution and I didn't mean to look argumentative.
Initially, I wrongly assumed that a solution would take the shape of a suggestion to use different libraries.

I thank you also for clarifying that there's not a compatibility problem.

I would be grateful for any solution or any idea by anyone who may understand where the problem is.

All the best,
Cesare