Update error code 30088-27 Office 2021 what to do to get corrected????

Check your Office settings and make sure that the Options > General > Privacy Settings.. screen has the "All connected experiences" option enabled so that you can then enable the "Experiences that download online content" option. (These are the steps for my Office 2016 Professional Plus running on Windows 10.) This should allow you to access the online Help system.

Did the online repair and it de-registered my entire office suite, took me a while to track down my activation code.

AND it still isn't updating.

By act of GOD, I just ran the update in 3 of our PCs and they all ran well. We will do the same to customers after hours and report back.

Let us know, Pedro. I just tried it again on my three machines and no change - two worked fine, the third failed.

Well .... besides our 3 PCs and 2 out of many, the rest still failing ........

In our end, NOTHING .... Microsoft's Magic

At the same time, we (and 50 other users) were having another annoyance: Microsoft Teams couldn't create TEAMS (funny). Both situations disappeared just today, almost at the same time.