Here is a walk tough to enable MAC pass though for when connecting it to a docking but don’t want to use the MAC of the docking because of network security.
This is only for the Lenovo Thinkpad T14s
Start the laptop by pressing the Power button and Press F12 on the keyboard to enter the Boot menu/BIOS
When your Boot menu/BIOS is Password protected, Enter the Password and press con Continue
Now Entering Boot Menu
Now you entered the Boot Menu. Your mouse is available here.
Move your mouse to App Menu and click on it
On the right side click on Setup
Now you are in the setup
Move the mouse to Config and Click on it.
Click on Network
Now you are in the Network config. On the last row there is MAC Address Pass Through. Click on Disabled (If it is not on enabled)
Select Internal MAC Address
When its set Press F10 to Save and Exit
Click on Yes to confirm
Now the laptop is ready.