No signal through 4K splitter


We are having some difficulties getting our new Pearl Mini to work.

Direct from MacBook Pro (late 2016) to Pearl Mini did not out of the box but after playing around with the EDID settings I got it to work by uploading a custom EDID - and after reading other topics on this, is now seems to work after a Restore of the EDID settings on the chosen HDMI input.

Through splitter - we have a setup where 3 4K televisions are feed through an 8-way splitter. When I connect the MacBook the screen displays in the televisions. When I connect the Pearl Mini to one of the outputs on the splitter the TV flickers but nothing shows up on the Pearl.
I have tried removing the outputs to the TV’s so the splitter only outputs to the Pearl Mini but still with no input registered on the Pearl.

Is there a known challenge by going through a splitter like this?