I migrated my Mojang account to Microsoft, and the email I used to migrate the account is...

I'm having a similar problem. After migrating my Mojang account to a Microsoft account, when I attempt to login using the Microsoft credentials, it shows up as a non-paid / demo account. I don't want to have to buy the game again. I wonder if it is possible the account was migrated to a different Microsoft account than the one I am using, but Mojang support cannot address that. I would love to be able to lookup what account name/email address my old Mojang account was migrated to.

That's normal, you can't access the old Mojang account after the migration, you need to use the email you used to migrate the Mojang account to, in the launcher you need to select Minecraft Java and then Microsoft login and then use the email you use during the migration process

Originally I bought the game with a mojang account (This was back in 2016 I think)

I then changed the email for the mojang account.

then with the migration, I migrated it to my current microsoft account that is not related to any of the previous emails.

The migration was successful and I was able to play game.

I stopped playing for a while, but after trying to log in with the same microsoft account that worked previously, minecraft was not there anymore.

Since I bought it with a mojang account, there is no record of a purchase/transaction.

Hi, my name is Fernando and I am an independent consultant for Microsoft products.

Make sure you are not logging in with your Mojang account.

Migrated accounts will only be able to log in with your Microsoft account.

If you forgot which email you used to create your Microsoft account for migration you will need to speak with Microsoft support to recover the email address used to sign-up.

You may not have completed your migration, please go to your Mojang account profile page and start the migration again.

https://www.minecraft.net/en-us/profile

You could try the basic troubleshooting:

Please double-check you are logging in to the same Microsoft account you used to migrate your Mojang account.

Make sure you are not logging in with your Mojang account. Migrated accounts will only be able to log in with your Microsoft account.

If you forgot which email you used to create your Microsoft account for migration you will need to speak with Microsoft support to recover the email address used to sign-up.

You may not have completed your migration, please go to your Mojang account profile page and start the migration again. https://www.minecraft.net/en-us/profile