So everyone I know seems unable to send chat messages 95% of the time as of about an hour or two ago. Sometimes they'll send, but most of the time right now they don't and I can't tell why. Something seems very broken.

Yep, same thing is happening here. https://forum.pso2.com/topic/5809/ship-2-chat-broke/3 Very frustrating >_<

(June 30 Edit): Everything seems fine now.

I suggest sending in a bug report

@Shadowth117 are you talking about voice or text chat