I logged into the launcher with my Microsoft account but it says I don't own Minecraft:...

Yes, the migration completed successfully. It showed me the confirmation message and everything. My skin is even transported to the Microsoft account, and I can log in with it both in Mojang site (It no longer lets me log in with the Mojang account, only with Microsoft account), and the launcher. But it says I don't own Minecraft java Edition, and only lets me play demo.

I have this exact same issue. Even though I migrated my account, it seems to think I don't own Minecraft. I can play Minecraft on the old launcher (logged into my Microsoft account) as it seems to recognise that I own the game there. Its only the new launcher that is having the issue and the Mojang website.

If you still have the old launcher installed maybe give it a go as it still works for me.

I don’t think it has to do with that. When I log into the Minecraft website it says that I have Minecraft purchased, it won’t let me log in with this account into the Minecraft launcher. Whenever I click log in with Microsoft or I click on my account to log in, it says that there was an issue while logging in.

Hello, LongerKnight. Thanks for reaching out. I'm Lucas, an Independent Advisor and a Microsoft user just like you. I'll be glad to help you out.

Are you trying to play Minecraft Java or for Windows?

If you sign in on the Minecraft website, does it show that you own it?

Waiting for your kind reply.

Hi LACYSDUDE! My name is Ricardo an independent advisor ready to help you with this situation!

If you migrated your Mojang account to a Microsoft account you need to change and log now with the Microsoft login option on the launcher and use that Microsoft account now

If even then you can only play the demo version is because you aren't using the correct Microsoft account or you haven't completed the Migration process, you can find more information about this here

https://help.minecraft.net/hc/en-us/articles/44...