Having issues Installing TWRP Recovery On Huawei Mediapad T3 10 from Windows

I’m running Windows 10 and an Administrative command prompt for all commands.

I got to to Install TWRP Recovery On Huawei Mediapad T3 10 as mentioned in this document
https://www.droidguides.com/unlock-bootloader-install-twrp-recovery-huawei-mediapad-t3-10/

I have:

• Installed the USB driver
• Enabled Developer options && USB debbugging
• The USB transfer has been set to PTP

From the link above when I run this command, it works without issues (adb devices show the tablet connected)

adb reboot bootloader

After that command is run the tablet shows this window

When I type this command

fastboot flash recovery recovery.img

it shows waiting for device, and if I run adb devices now the list of devices is empty

How can I solve this.