Title alone is pretty self explanatory. JP had Shop Pass removed from FUN scratch and to my knowledge added no alternatives. So if you did not stack up on the passes beforehand or do not have a premium you can't sell items anymore. Sneaky removal too, only "mention" of it was the expiration date on the FUN scratch catalog page, which to be honest no one checks because it hasn't been relevant for 8 years give or take.
Might wanna start stocking up on those passes just in case, while you still can.