I'd like to help anyone that has been having issues with the ALPR not working in BI 5, don't make the same mistake I did because 1 checkbox was the difference in it working and not working...
After setting up a profile on PlateRecognizer.com and importing the API key into BI and finally setting up the AI config at the camera level under TRIGGER, I found I was not capturing any plates, that was until I unchecked the "Only for confirmed vehicle alerts" box.
I guess that box is tied to DeepStack or Sentry Alerts but it's not made clear so once I unchecked that item, I started seeing Alerts with license plates in my alert window and hits on the Plate Recognizer website.
Thanks BI team, this is going to be a great feature for me.