Launcher does not register I have full version bought

I bought Minecraft in June 2020 through Mojang, it was called Minecraft: Java Edition at that time. I have not played for a while and now I want to again. I transffered my Mojang account to Microsoft account, but when I log in to my Microsoft account connected with the game, I can only play demo/trial. I read several articles on the Internet about possible solution but none of them helped me. I tried everything (reinstalling, deleting cache etc.). Can anyone help me please? I tried contacting support but no answer...