Seems to be a hardware related thing, as WiFiSpoof (https://wifispoof.com) lists... | Hacker News

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		simonklitj on Oct 6, 2019 \| parent \| context \| favorite \| on: macOS no longer allows changing wifi mac address Seems to be a hardware related thing, as WiFiSpoof (https://wifispoof.com) lists 2018/2019 devices as the ones not supported, and not a specific macOS version.

miles on Oct 6, 2019 | [–]

In fact, they explicitly recommend using Mojave on that page:

"10.11 or better (Mojave recommended)"

Dunedan on Oct 6, 2019 | [–]

That smells like it's related to the T2 chip.

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