relock bootloader P9 lite VNS-L31

I Have a VNS-L31 P9lite single sim.
It’s unlocked bootloader.
I readed out de bootloader code with FlyCaptain Huawei.
This is working, i got the code.

Now i trieing to relock the bootloader but this is not possible/ working ?

I want to relock bootloader because phone is gving a startup message tha phone is unlocked……. i hope to fix this so that there is no message after start up.

Someone can help me,

i also tried it with adb/fastboot oem (re)lock ……….. not working.