Can't promote others or leave network

@StevenW606 Can you just select a different active network?

You might want to try leaving via the titanfall site. If you log into the Titanfall 2 site you can choose Networks, then Mine. Choose the appropriate network and from here you can try out the Leave Network button. 

https://www.ea.com/en_gb/games/titanfall/titanfall-2/

Thanks for the post, I hope this helps.