Make sure you send us the capture card make, model and camera format, resolution so that we can test it
As a quick workaround we can offer two options:
Use vMix to output the scoreboard camera via NDI and choose NDI input in Scoreboard OCR
Use vMix to output the scoreboard camera as vMix 2nd output (virtual capture device) and use Local Capture Device in Scoreboard OCR by choosing “vMix Video External 2” and Resolution “automatic”
You could also use VLC to create NDI output from your capture card