“Apple is advising all those affected to put their Tahoe upgrade on pause until it releases a new build that does fully support the M3 Ultra. Until then, 15.7 is the limit for Apple’s most powerful and expensive Macs yet.”
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Potentially good news:
“According to Apple’s release notes, macOS Tahoe 26.0.1 addresses a bug that was preventing Mac Studio machines with an M3 Ultra chip from being upgraded to macOS Tahoe. A failed hardware check was causing macOS Tahoe installation attempts to be aborted, with Mac Studio users ultimately stuck on macOS Sequoia. Mac Studio users who were unable to install macOS Tahoe should now be able to.”