Issue adding friends

I have an account originally from Americas. Now I am playing from Europe region.

The problem that I have is that when I add a new friend playing
starcraft remastered multiplayer the request doesnt appear either when I create or other player makes the request.

I also have some friends that appear inside Starcraft remastered game but not in Blizzard Battle.net windows application.

I request a solution for this, and be capable of adding friends.

Thanks