Unable to add friend

Hi,

When I am viewing any match, and I want to add friend from that list, the 'Add Friend' button is not appearing against some of the managers. Why the button is not appearing for some managers?

I have another question, I have added my friend in the T11 using facebook, my level is 36 and his level is 34 but he cannot by my 2* or 3* players. Why the option is disabled?

Thank you for your help.

Regards

I think that you are unable to add some of these people because they are on a different server and therefore the only way you could do it is to add them as a friend in Facebook.