Parking Ticket while parked inside my apartment complexes garage….

I was on vacation out of the country and had my car parked in my apartment complex (quantum) secure parking garage while I was gone in the spot I pay for monthly. I got home and there was a Parking Invoice on my car since I did not update my cars registration sticker. While I haven’t updated it since i’ve been out of the country, I have it in the mail and it’s been renewed.. Is it legal for the apartment complex to hire this company to come around serving tickets to residents parked on private property?!?

I also checked my lease and it states nothing about tickets but does say a car can be towed for this. Yet it seems they don’t tow anyone ever for any reason..