How to unlock bootloader of Vivo Y33S - 'Waiting for device' error

I'm facing some challenges with unlocking the bootloader of my Vivo Y33S and could really use some assistance. I have tried a few methods, but I'm encountering two specific issues: The MTKclient software doesn't seem to work for bootloader unlocking on my Vivo Y33S. I've followed the instructions to enter in Brom mode, but it doesn't recognize my device or initiate the unlock process. When I use the Vivo Fastboot software and execute the commands fastboot vivo_bsp unlock_vivo or fastboot bbk unlock_vivo, I receive the following error messages:

FAILED (remote: Unrecognized command vivo_bsp unlock_vivo)
FAILED (remote: Unrecognized command bbk unlock_vivo)

I have verified that USB debugging and OEM unlocking are enabled on my device. I'm running stock firmware version PD2147GF_EX_A_38.13.0. I've also ensured that I have the latest drivers installed. Has anyone successfully unlocked the bootloader of the Vivo Y33S? If so, could you please share any alternative methods or potential solutions to overcome these challenges? Your insights and expertise would be greatly appreciated! Thank you in advance for your help!