This was a previous bug back about 2 months ago, but it seems it has returned.
Saw this may have happened a few days ago to us too.
This is happening to me and some of my guildies too =/.
This just happened again in our match about 2 hours ago. Someone was calling for help on a T3 keep and spamming the emergency waypoint link and no one on other maps saw it.
I have the same issue for at least 4-5 days now any news about a fix????
Yep, it's completely broken. Works for some, and some people can not see anything on that channel.