I was fired for staying home while infected with COVID-19 (which I got from work). My final paycheck came and I wasn’t paid for the time I was sick. How to email HR?

Please, anyone who confidently knows the FMLA laws / labor laws in the US, let me know a professional and polite way to request my wages. I don't want to anger them, I just want the money. Thank you. https://www.dol.gov/agencies/whd/pandemic/ffcra-employee-paid-leave#_ftnref1 I think this explains how I'm entitled to the pay. Edit: …. people are saying this expired. I was advised by an attorney to email them requesting these wages but apparently this isn't the law anymore? I'm pretty crushed by this information.