All of the Jumpseat issues I’ve heard about could have been avoided by the Captain walking up and asking if there were any jumpseaters.
I now go up to the gate at every outstation and ask.
Odd that this happened in Vegas as it’s our hub and I wouldn’t think a jumpseat would have been an issue there. I agree this needs to be addressed via your jumpseat committee to ours. They do a good job and will make it right.