Need help to flash ROMs on a J727U.

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So, I got a Galaxy J7 (sm-j727u) and have been trying all day to flash TWRP and then LineageOS on it.

First off, I cannot find the OEM Unlock option no matter what I've tried.
So I eventually decided to try and get it flashed without that.

Result of that is a FAIL every single time.

Help? I've tried most things and will probably just keep the phone on for 7 days (and using it!) to attempt to make the OEM Unlock option show.

Anything I need to do/am missing?