A traditional pollen hash is probably the hardest thing to vape and most messy. Never put pollen hash into a concentrate device like dab-pen, e-cig or a concentrate attachment for herb vapes. All of those depend on the concentrate to be meltable and evaporable without leaving any mess behind. A pollen hash will not do that, it will mess them up.
I think the only way you can vape pollen hash is to grind it together with weed into an fluffy weed-hash mixture without any large chunks and then vape that just like weed in a herb chamber of a vape. Don't put more hash than weed into the mixture or you'll risk clogging it. I don't think there's any way to way only pure pollen hash. The hash pieces should be as small as possible, if they are chunky, the vape will not be able to reach the goodies inside, only on the surface, but it will also dry it up, so you could then break the chunk easily with by stirring and make more vapor accessible with the next hit. I think a convection vape would work much better for vaping such a mixture. A conduction vape would work too, but weaker.
Don't forget to empty (and better - brush) the bowl after the session when it's still warm, it you leave hash ABV to cool down in the bowl, it could clog it up. That is also applicable to only weed, but hash especially.
I would advise to try steer away from pollen hash if you want to vape, find meltable concentrates for concentrate vapes or try to get back to pure weed. Do you need hash medically? If not, then a need for hash is a sign of tolerance out of control (or shitty weed...?), then I would advise to jsut bear with the disappointing effects of pure weed for few days and the brain will adapt and turn that back a to a new normal like the hash effects used to be.