@MojangSupport I migrated my java account to an old microsoft account which both use the same email. When I go in to play minecraft, it's saying that I don't own the game anymore and that I can only play the demo. Please help me.

That sounds really frustrating! Generally that error means you may be logging into the wrong account. Please double check that you're logging into the correct account and check out our troubleshooting steps here to see if that fixes this help.minecraft.net/hc/en-us/… ^AC

It might also be that I have two microsoft accounts that use my java email, could that me the main problem. If so how would I be able to switch to the other one.