cant play as Hong Kong U23s manager

This by design, I'm afraid to say. Thanks for raising this with us though!

1 hour ago, Abdullah Patel said:

This by design, I'm afraid to say. Thanks for raising this with us though!

I think it's because it's a "U-" or a reserve team. We have such teams shown in the team selection window, but we can only play these teams when we are in the first team.

 

Same with 'Juve next gen' in serie C for example