Minecraft Dungeons Hero Edition Extension Pack Not Working

Hi,

This morning I bought the Minecraft Dungeons Hero Edition Extension Pack on the Microsoft store on my Windows 10 PC so that I would be able to add it to the Minecraft dungeons game that I had bought about a week earlier on the same device.

Minecraft Dungeons worked really well on my device, and I had been really enjoying it so I had no doubt that the installation of the DLC pack would be fairly simple. However, after purchasing the DLC pack and clicking on the "manage" button just told me
what the DLC pack included and that I owned it. There did not seem to be any obvious option to add it to the Minecraft dungeons game.

I then looked at the comments section of the product, which seemed to be overwhelmingly negative; many people were having the same problem that I have been having in that they are not being given the option to add the DLC to their game. There was, however,
one comment that insisted that it did work and that you need to purchase the game on the same platform, which I have.

This ordeal has left me very confused. I bought the product on the correct platform and there doesn't seem to be a way to apply it, which I am sure that there will be. Please could someone talk me through how to add the DLC to my game on the same platform
and device?

Thanks.

:)