The 38x46mm Trap
Almost the same as 35x45mm, and rejected anyway.
Myanmar's e-visa photo is 38mm wide by 46mm high. Set next to a standard 35x45mm passport photo the difference is three millimetres in one direction and one in the other — invisible by eye, and enough for an automated check to reject the upload.
This is the main reason Myanmar applications fail on the photo. If you have spare passport photos from anywhere else in the world, they are almost certainly the wrong size.