Someone else posted they also have an issue with A D downloading.
https://forum.dvdfab.cn/d/472320-audio-description-downloading-from-nowtv
Might want to repot it to SF feedback.
Or wait till someone who has access to NOW might figure a solution.
I am not sure a log will help but someone could try posting a log, but it might be something either with NOW or how SF interacts with NOW.
If SF is only downloading the AD audio changing settings in Kodi or any other player won’t help if none AD audio is not available in downloaded file.
Sometime back I had the issue on Amazon and just had to wait till SF fixed it. Thankfully it was only while downloading certain shows.