Minecraft migration to this account

I migrated my mojang account (which is very old and I have no idea the email that I've used for it.) to THIS microsoft account at least a year ago. Everything was completley fine and I was playing minecraft after the migration happened. Around the beginning of this year, I decided to launch up Minecraft again and start a new world, but when I opened the launcher, it said "Play Demo." I tried and tried to find fixes for it but nothing worked, now around a week or so ago, I tried again, on the same exact microsoft account that I've always had and played on, and it said "Buy Now." Like I said i have no idea what my mojang account login information is, so my only question to the people that work at microsoft, is could you please tell me if, and when I migrated my mojang account to this microsoft account and what the email is, I believe the mojang account should be named something along the lines of "viper28srt", or vipersrt28." What is extremely weird is there is no email that was sent to my microsoft account saying the migration was completed. The only thing I could think that would make that possible is when I changed my email address on this microsoft account, to make this a little more clear, my main email account was changed to my second email account, and then I changed it back to my main email account. If you have any further questions, feel free to ask. Before anyone replys to this saying "Contact mojang about it." I do NOT know the email of my mojang account, and every email I have checked has no conformation of me purchasing the game a couple years ago. So to sum this all up, I would #1, like to know if, and when I migrated a mojang account to this microsoft account, and if possible, what the email was for that mojang account, so I can finally start to play Minecraft with my friends again. (Before the responses come in from support, I have tried every single possible thing to fix my launcher, and I can confidently say that it is NOT a launcher bug, this has nothing to do with the launcher, it is 100% an account related issue. My only goal at the moment is figuring out which email I used for that mojang account that was migrated to this account, It would've been quite a while ago. Thanks.

:)