Only 32 bit distros are working on a 64 bit Intel Atom CPU, what could the problem be?

Intel Atom N2600.

The Intel link says it's 64 bit but I can only get the 32 bit Lubuntu 16.04 to run on it. Slacko Puppy Linux 32 bit also worked.

It still works mostly fine (bar some screen tearing which I'm also trying to fix) but I couldn't figure out why the 64 bit versions won't work.

The vendor disabled 64-bit support.

There is a bios with 64-bit support in this topic. Good luck with flashing it.

According to Wikipedia it's probably the chipset or BIOS.

Intel states the Atom supports 64-bit operation only "with a processor, chipset, BIOS" that all support Intel 64. Those Atom systems not supporting all of these cannot enable Intel 64.[26] As a result, the ability of an Atom-based system to run 64-bit versions of operating systems such as Ubuntu or Debian GNU/Linux may vary from one motherboard to another.

I actually eventually found this answer while writing the question but figured it was worth posting since I couldn't find an answer here. It might not be specific enough to Ubuntu though?