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It could be that macOS 27 never got Unix certified. Wayback Machine on Oct 7th only shows macOS 26 being Unix certified.

https://web.archive.org/web/20261007103902/https://www.openg...

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27 wasn’t certified and 26 was listed but is now removed.

From that Wayback page, it looks like only one version of macOS is certified at any one time: the latest version. Since macOS Golden Gate was only recently released, perhaps it's a process blip and we'll see Golden Gate listed soon.

Nope, Sequoia and Tahoe both remain registered: https://www.opengroup.org/openbrand/register/apple.htm

Interesting - when I visit the original page from this post and choose "Filter by Standard" I can see Tahoe under UNIX 03, but only AIX is listed under UNIX V7.

This suggests that different parts of the website aren't necessarily in sync with other parts, information wise...

26 is in UNIX 03, if you use the pulldown

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