Can’t Guild chat

Hi I’m in a guild with my brothers. We’ve been working hard and managed to push into the 1700’s. We now have other players joining our guild. Does anyone know how to contact or chat to other guild members because I can’t seem to locate any section to say welcome or offer any advice to them. Any help would be appreciated. Thanks

Open global chat then press RB, you will go into your guild chat

Cheers for the info. Does that let you if they are playing or is it a case of waiting for a reply.

Just a case of waiting for reply. You used to be able to see when they were last active but I think it got removed due to privacy policy with xbox/sony. Or just check their contributions on guild roster page every few days