OnePlus Two - Unable to unlock OEM

Hello all,

I recently bought a OnePlus 2 and attempted to root it. I can only remember trying to root it with a locked bootloader (which caused the OnePlus startup to hang). Eventually, I put the OS back in. Now, in a second attempt to root my phone, the first step was to unlock the bootloader. Every time I type "fastboot oem unlock" it brings me back to TWRP. When boot back into fastboot and check device info, I get this:
(bootloader) Device tampered: false
(bootloader) Device unlocked: false
(bootloader) Device is_verified: false
(bootloader) Charger screen enabled: false
(bootloader) Display panel:
(bootloader) console_locked: 1
(bootloader) exec_console_unconsole: 0
OKAY [ 0.070s]
finished. total time: 0.070s

Also, attempting to flash any recovery (or any other command) returns this:
target reported max download size of 536870912 bytes
sending 'recovery' (22032 KB)...
OKAY [ 0.719s]
writing 'recovery'...
FAILED (remote: device is locked. Cannot flash images)
finished. total time: 0.742s

Any suggestions? I've tried searching so many different threads all over Google.
Files that I have available to use: stock recovery, TWRP recovery, latest full ROM from OPT

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