What happens to your existing work permit if you get Open Work Rights via APRC?

If I can ask here. I have gone into 3 counties NIA, all extreme south, and everyone one of them have told me I don’t need an OWP. I have had an APRC for a while now, they won’t let me apply. I’m wondering how important open work permit is, or is this just NIA not knowing the law and I should walk into a different arm of the govs office? I have gotten a lot of misinformation and contradictory statements over the years, so curious if this is BS too. Just seems interesting 3 offices had the same answer of don’t need one, rarely is the gov that consistent haha.

I’m legally a farmer, but will probably sign on to a company this year hence the question.