I can't send messages it keeps on say message not sent

I can't send messages i keep trying and it says "unable to send message" so i get on my brothers account and he can send messages -.- whats going on?

Same thing happens to me, but I live in the U.S. and it only started happening a few weeks ago. I barely send messages and when I do send one I get an error saying "Error message could not be sent" Eventually If I keep clicking it; the message is eventually
sent. I doubt it is my network. I deleted my profile yesterday and it stopped for awhile then started again.

I'm experiencing this same issue. they have the status update showing it's fixed, but still can't send any messages. I see my friends list and my messages, but every time I try to send a message, I get any error message "Your message could not be sent".
I thought this was fixed? I keep checking Xbox Live Status and still they're pretending it's fixed and not even bothering to update it.

I can't text my friends because it keep saying u can't send any messages because of your last behavior

I can receive messages from other people, but when I get write of them it Says message cannot be sent it sends me back to the Xbox website and I didn't follow all the steps and all that, but I still can't message no one