Hello! A while ago, there was a paperjam, and this piece was removed in order to fix it. Im not sure how to get it back in or even where it's supposed to go. The printer works fine except for then trying to print double sided, if that helps.
I'm unsure if the image is working so here is a link to it. It's curved black plastic, and there is spaces at the same intervals of the printer wheels, but I can't figure out where to put it.
The part which is seen on your post is not customer replaceable. The printer service guide is not available, hence I request you take the printer to the nearest service center or reach out to HP Support in your region regarding the service options for your printer.
Hope this helps!
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