Verizon phones will not accept any custom ROM. This has been done this way since the S4/Note 3. The way Verizon locks their bootloader effectively prevents other ROM’s from being installed - even the reference Samsung ROM from the Unlocked by Samsung series. AT&T is also guilty of doing this so Verizon isn’t alone. IT HAS to be the carrier specific ROM or it prevents it from BOOTING.
The feature Verizon uses is known as Samsung KNOX. They use boot signature enforcement, which verifies the ROM signature against the “correct” signature. The phone will not boot without the Verizon ROM installed since the signature varies per device (Unlocked, T-Mobile, AT&T, Verizon, Sprint). The KNOX “feature” prevents you from removing the Verizon ROM or modifying it to remove the bloatware. Root can be used to "force” it off, but you cannot change the ROM to remove it permanently, but it triggers the 0x1 flag and permanently disables Samsung Health.
How I’d sell it is I’d sell it as unlocked for any carrier, but explicitly mention it’s a Verizon phone. This is sufficient because while it’s SIM unlocked (FCC open network license requirement), it is still a Verizon phone. It will also deter buyers who want the ability to tinker with the ROM, so you will not need to worry about the KNOX 0x1 flag being tripped and hurting the resale. You are better off losing a sale from someone who opposes Verizon’s lockdown practices to avoid getting a tripped phone back.
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