Window doesn't work- but new master switch and new window assembly

Anyone experience a situation where one of their windows (for me it's the left rear/passenger) does not work from either the passenger door switch OR the the driver's door master power control switch...AND where a new master power control switch was installed...AND a new window assembly for the passenger door was installed. ALL OTHER WINDOWS WORK from both their respective door switch and the master control switch. The master cut off also functions.
I saw the YouTube video about testing for power at the window motor...but didn't see anything about what might be causing it and how to fix. If you dealt with this situation, please let me know.