Black screen when loading

I have a common problem where my screen is black on one of my phones when trying to load into fgo. I have tried restarting my phone, re downloading everything and clearing cache etc but none has worked so far.

One piece of info that may help is that this phone is a samsung note 5 that i installed a custom s20 ROM on. i am able to run other apps with no problems but fgo has never worked. This is not urgent as this is only a backup phone that i occasionally use but it would be very nice if i can get fgo up and running on this one too

Turn off developer options if its enabled.