@MojangSupport Official tweets are saying that account migration has begun, but http://help.minecraft.net is saying they haven't. Have they actually begun?
Apologies for that. You still have some time since account migrations have not begun. You’ll see a note in the launcher when it’s your turn. More info can be found at https://help.minecraft.net/hc/en-us/articles/360050865492-JAVA-Account-Migration-FAQ …. ^RL