I returned!
I discovered the problem. Never that we were going to find out.
I redid what you told me. But I put the value in “Launch Velocity” instead of 20, I put 100. And it worked normally. There is only a difference in speed between them.
I tested it the way I had done it before and it also worked. 
Really, I had done it right when I created the Post. Just like you. Either way it works. The exact same thing happens.
Final conclusion I reached:
The 20 value that I had chosen for the Launch Character Z is not enough to make the character go up. However, I don’t know why, there is a difference between the speeds of the Server and the Client using the “Launch Character” node. Perhaps it is because he repeats the command twice on the server. For this reason, one of the characters in the video went up and the other did not. The Client did not have the necessary amount to go up. As the Server gains twice the “Velocity”, it went up. At least that’s what I think happens, kkkkkkkkkkkk.
New Issue:
How to adjust the speed difference? The Character that simulates the Server is faster. And both have the same Velocity value. And now?
Sincerely, HighRender.