OEM Unlocking option not being checked is my problem, but how to select it when its greyed out?
C:\Android\com>fastboot devices
HT7761800083 fastboot
C:\Android\com>fastboot oem lock
...
(bootloader) [KillSwitch] : /dev/block/bootdevice/by-name/frp
(bootloader) [KillSwitch] Last Byte is 0X00, disable unlock
(bootloader) [KillSwitch] oem unlock Turn Off!
OKAY [ 0.020s]
finished. total time: 0.021s
C:\Android\com>htc_fastboot oem lock
...
(bootloader) [KillSwitch] : /dev/block/bootdevice/by-name/frp
(bootloader) [KillSwitch] Last Byte is 0X00, disable unlock
(bootloader) [KillSwitch] oem unlock Turn Off!
OKAY [ 0.005s]
finished. total time: 0.005s
htc_fastboot finished. total time: 0.189s
C:\Android\com>