Just noticed that a couple of PM’s I thought I had sent - one a couple of days ago, the other a few minutes ago - are sitting in my PM “Outbox”. I have no idea why they were not sent when I hit the “send” button. Nor do I know how to get them sent. Never had that problem before.
FWIW, I did note that I got a “your message has been sent” type message after “sending” the most recent message. Believe I did for the older one as well.