Communication between servers/factions

I don’t know if it’s a bug or if it’s just an intended effect, but can we please do away with the inability to contact people via whispers? There have been so many times that I’ve tried to whisper someone that was in my party to help coordinate something or to help setup another group and all I get is:

“no player named XXXX is playing”

Or the person whispers me, and I literally can’t message them back due to the same thing. It’s incredibly annoying, frustrating, and doesn’t make sense any more. Do away with these limitations and fix it please.