Why do I need to sign for SIM card delivery?

I ordered a SIM card which was free but for some reason xfinity says it needs to be signed for to be delivered even though the website says signature not needed for delivery. FedEx seems to like to deliver early in the day when I’m at work. They have attempted 2 deliveries and they will try one more time Monday and it shows they will try again early in the day when again I will be at work and because of how xfinity has it set up you can’t choose a time window or have it dropped off at a fedex store just a mile away which I would need to sign for with either option. Instead the only way to get it from fedex is to drive 40 miles one way at their pick up facility. Just sad since it’s a free SIM card I’m was trying to get.