@MojangSupport I have been unable to join Minecraft or Minecraft.net, it comes up with "We could not validate your access, please try to login again." I have tried every available fix but it hasn't worked so far.

I have migrated and I have uninstalled/redownloaded the game, I would not like to lose this account as it has lots of sentimental value to me and I have spent hundreds of hours on it.