I have Minecraft already purchased on my windows computer but for some reason I am unable to purchase Minecraft dungeons hero edition. I have tried logging out and logging in, clearing my cart, and waiting for days (on day 3 currently). Not sure if is just something wrong with the website or what.
This appears to be a payment related issue and the bug tracker does not have the appropriate resources to help you with this problem. Please read through this article to see if this fixes the issue and if it doesn't, please contact Mojang Support, as the bug tracker is unable to provide you with assistance.