To understand the error, you must first understand the structure of a MAC address.
If you try to set a MAC whose first octet is, for example, 01 (multicast) or 00 (globally unique with LAA=0), some drivers will refuse or silently ignore the change. To understand the error, you must first understand
However, there is a specific bit in the (the first two characters) that determines if the address is a "universally administered address" (burned into the card by the factory) or a "locally administered address" (manually set by you). To understand the error
If the change doesn't take effect immediately, try the Wi-Fi adapter in your Network Connections settings. Summary of Constraints To understand the error, you must first understand