Projects burned on Blu-ray not playing on standard Blu-ray players

The most recent project that I finished will go through the share to Blu-ray process and burn in to a blu-ray disc, but the disc will only play on my 4k blu ray player and will not play on standard blu ray player. The disc appears on the players menu, but when selected to play the screen goes black, as if in the loading process, and then after a moment returns to the blu-ray players menu screen. My standard blu ray player and 4k player are Sony brand. I have tried every possible option I can think of to burn the blu ray to get it to work on a standard blu ray player, but nothing seems to be working. Is there setting that I am missing that needs to be adjusted? Was there a change in a recent update that is affecting this. All previous projects have worked with no issue. Any ideas??