Thanks for the response fellas,
This is a finished build running win10 with Icue installed.
The fan in question works perfectly when plugged into ports 1-3.
I have also tested ports 4-6 with a known good fan and no lights.
I'm pulling power from the cpu fan if that matters??
As for testing signal chain, I can run the 3 front cooling fans in any order with no signal loss.
I wasn't even going to use this fan because it would block part of the RGB on the X570MB, but once I found it didn't work it's been driving me crazy