What is the purpose of U23manager& assistant manager

I exchanged my phone for another one before the update (120k stadium) and had no problems i saved it on cloud and would've loaded it without problems but i had to exchange again my phone for problems of company and i did the same steps saved it on cloud but when i try to load it on my new phone says like has no space for memory i'll post a pic of it. This happened after the last update and can play the game. Already sent two msg but none answered it

This is fantastic.

4-3-3 Formation needs fixing, I feel Like I can’t win no games with that formation. Lower leagues or Top.