The hack that some Mac users were using to try out the new Siri AI, skipping the waitlist, no longer works.
Apple released the second developer beta of all its OS 27 updates yesterday. In macOS 27 developer beta 2, the hidden Terminal command no longer enables Siri AI. After you update, you’ll find yourself back on Apple’s waitlist. If you previously enabled it on your Mac, your access will be revoked.
But no worries — some users on Reddit may have found a way to get yourself accepted fast.

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