I'm trying to install GrapheneOS on my refurbished Pixel 4a (not the 5G version), and I can't seem to turn on OEM unlocking. It says that OEM unlocking isn't allowed on carrier locked devices. I looked back at the listing I got my phone from, and it says that it is a verizon phone. I assumed this would be fine, as I use verizon anyway. Does anybody know how to fix this? Can I call verizon or go into their store?