Project keys for MCJE and MCBE didn't change with it's project names.

• Since September 18, 2017, with the release of 1.12.2, the original Minecraft is now called "Minecraft: Java Edition", so in the bug tracker, his project key should be MCJE instead of MC.

 

• Since September 20, 2017, with the release of the Better Together Update (BE 1.2.0), Pocket Edition is now called "Minecraft" (or Minecraft: Bedrock Edition) so in the bug tracker his project key should be MC (or MCBE), instead of MCPE.