can't buy minecraft xbox one edition

Back then when the Xbox One Edition (the Minecraft with the "Xbox One Edition" in the name, not the new "Minecraft" for Xbox One) was released, there was a short time, where you could buy "Minecraft Xbox One Edition" for a reduced price, if you owned the
original Xbox 360 Minecraft digitally.

Xbox 360 Minecraft and Xbox One Edition Minecraft are two different things. Like having a vinyl record of a music album and then having to buy a CD of the same album. Or having a DVD of a movie, and having to pay for the BluRay version of the movie.

However, the Xbox One Edition can't be bought nowadays anymore. Have you had the Xbox One Edition digitally, you would get the "Minecraft" (without the "Xbox One Edition" in the name) for free.

You can however transfer your Xbox 360 worlds to the Xbox One, if you somehow got hold of the "Xbox One Edition" before it was replaced by the new "Minecraft".

To do that, start your Xbox 360 Minecraft and make sure it's on the latest version. Then use the menu entry to upload your world to the online cloud.

Now start up Minecraft Xbox One Edition and import your world.

With your world in the Xbox One Edition, you can then start the "new" Minecraft on the Xbox One, and import your world from the Xbox One Edition to the new Minecraft.

The Xbox 360 version of Minecraft is not backwards compatible on the Xbox One.

If you had owned Minecraft 360 digitally, you could have had the benefit of getting the "Xbox One Edition" at a reduced price, and if you owned the Xbox One Edition, you could then get the "Minecraft" without "Xbox One Edition" on the Xbox One for free.

However, these offers have all now expired, and the only way to get Minecraft on your Xbox One is to buy the game again.

Be aware: You can't import your Xbox 360 worlds in the newer Xbox One Minecraft!

If getting your Xbox 360 world over is important for you, you need to find someone with "Minecraft Xbox One Edition" and import it to that game first. Then import that world into "Minecraft" on the Xbox One.

You need to buy Minecraft not Minecraft Xbox one edition. The one edition has been delisted from the xbox marketplace and replaced with Minecraft. If you want the one edition you would have to look for it on disc.

As Smwutches already correctly stated, you had to have played Minecraft Xbox One Edition for at least 5 hours BEFORE January 31st 2018.

Unfortunately, that offer ended last year.

So you can't get the free upgrade to "Minecraft" with your Xbox One Edition version anymore, and have to buy Minecraft at full price, I'm afraid.

You cannot, The Minecraft win10 beta is a ported version of the pocket edition, which means you can't play with anyone unless they have the beta as well, you're probably best buying the PC version of minecraft, but you still can't play with Xbox One unfortunately.