I bought the Minecraft Java Edition as a gift for a friend (via minecraft.net) and used my Microsoft account to log in without thinking about it, because I thought it could simply be transferred to a new account. But now I can't find the option for it, and wonder if it's even possible?
The only thing I found about it on the internet is that you can't transfer it if you bought MC in the Microsoft Store. Does that make a difference?
Can't:
https://help.minecraft.net/hc/en-us/articles/360052640292-Unlinking-a-Minecraft-Java-Edition-Account-and-a-Microsoft-Account
However, you can request a refund. Everything is described in the link.
