You will have to request Minecraft Support to delete that existing Java Edition profile from your Microsoft account. Once they do so, you can migrate your Java Edition profile to it. I’m assuming their support’s pretty hammered right now, so I’m not sure if they will get back to you in time.
The easiest thing to do would be to choose a different Microsoft account to complete the migration, despite the inconvenience it might cause later on.
Migrate it to your child’s/spouse’s Microsoft account if you have one. If you’re feeling extremely generous, migrate to a friend’s Microsoft account. You can then swap usernames between the accounts at a later date.
Pleasantly surprised by the list. Should appeal to a wide variety of gamers. I don’t mean offense to any devs, but MS was truly scraping the bottom of the barrel to find games for Games w/ Gold for the past few years.
Some odd choices, like having the sequels Dishonored 2, Ori and the Will of the Wisps, Doom Eternal and Psychonauts 2 but not Dishonored 1, Ori and the Blind Forest, Doom (2016) and Psychonauts 1.
They haven’t raised the prices for Core thankfully unlike PlayStatiton, but I’m still probably not signing up for it. Money’s tight right now and the last thing I want is to pay for access to online gaming.
Redeeming that Windows 10 Edition code is separate from migrating to a Microsoft account. The code was just a free perk.
If you have not migrated your Mojang account yet, you have two options:
Migrate your profile to the same Microsoft account as the one on which you redeemed that Windows 10 Edition code. The benefit of this is that all your PC Minecraft is on one login.
Migrate your profile to a different Microsoft account, allowing you to double dip. You’ll end up with two Microsoft accounts, but also two Minecraft: Java Edition and Minecraft for Windows 10 licenses. It’s free real estate.
If you are currently able to login and play, then you should be good. I believe they blocked Mojang and Legacy accounts from logging into the launcher a while back.
Doesn’t hurt to check though. Make sure that the upper left corner of the launcher shows your Xbox Gamertag (may be different from your Java Edition username) and says “Microsoft account”.
If you purchased or redeemed a code for Minecraft for Windows 10 Edition in the past, your Microsoft account is eligible to get Minecraft: Java Edition for free. If you log into the Minecraft Launcher with your Microsoft, it should prompt you to set up a Java Edition username (separate from your Xbox Gamertag).
More information can be found on their help page here.
I know this comes across as one of those classic phishing emails that claim to require your immediate attention or else your account will be deleted, but unfortunately in this case it’s legitimate.