So I run a Pie-Hole DNS server here at home. But I could not find out why the custom entries I put in were not resolving. Exploring around the routers setting I found one called prevent DNS rebinding. When I disable that my custom entries on my Pi-Hole were working, to test to see if it was just a fluk I re-enabled the preventing of rebinding, and they stopped working, disabled it and they started to work again.
So if you use a Pi-Hole for your DNS server at home, and you enter custom entries and have Verizon as your ISP, and it not working go into your router and turn off “Disable DNS rebinding” and your entries on the Pi-Hole should work.