Huawei mate 20 lite bootloader-unlock doesn't work due to FRP
have you enabled allow OEM bootloader unlocking in settings, it is in dev options
Here's some steps:
(optional, to enable dev options):
settings &gt;&gt; about phone &gt;&gt; (tap build no. 7 times)
enable oem unlocking:
settings &gt;&gt; system &gt;&gt; advanced &gt;&gt; developer options &gt;&gt; allow oem unlocking(turn it on)
Screenshot:

(mine is disabled as I have a unlocked bootloader)