they dropped & disabled on foot track ir support some time ago now with little to no explanation as to why? afaiaa
i think it may be due to head/ body alignment issues going out of sync during use and as they could not fix that without a total rewrite they simply disabled it..........
but that is just speculation on my part.
as you mentioned in ship an srv works as intended....
*i wrote a little python script to realign out of sync issue on the fly which i triggered by using voice attack so i am disappointed they dropped it also

so in answer to your question there is no solution you can apply to re-enable it..........