Reddit mentions of BIQU MK10 M7 0.4mm Extruder Brass Nozzle Print Head for RepRap 1.75mm Filament 3D Printer (Pack of 5pcs)

It's hard to tell from the picture but if the nozzle indeed does not have a hole, I would try using the included drill bit or some other thin metal (guitar string, dental pick, etc) to poke it. They do a demo print on the Maker Select to show you what they are capable of, where it is possible it got some filament clogged inside of it while doing that, although I have never heard of that before.

With that said, I would have them send you a new nozzle but if you are in a hurry and just want to start printing, you can grab some replacement MK10 nozzles on Amazon.

https://www.amazon.com/gp/aw/d/B01FJS19C0/ref=yo_ii_img?ie=UTF8&psc=1

However, I don't recall being able to manually force through with my previous nozzle either.

https://www.amazon.com/gp/product/B01FJS19C0/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1

I very much don't recommend them. Just had a second one fail after only 5hrs. Don't know if it's my filament causing a jam, but no reason the nozzle should fail that badly from a jam.

I ordered this nozzle set from Amazon and it's worked pretty well for me.