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.

Briefly for information.

I just ran an online update of Microsoft 365 to the official version 2407 (build 17830.20138 - current channel) with OfficeSetup_eng_x64.exe. https://learn.microsoft.com/en-us/officeupdates/current-channel#version-2407-august-01

The update ran smoothly through, but the error message is STILL there!

I've been giving up believing that Microsoft is or will be able to fix this error!!!

Well, just tried an online repair just to see if anything changed. I was surprised, it actually updated to the new version. Version 2407 (Build 17830.20138)

So did the check for updates and, damn, no error message. Office is up to date.

Now, while this did not throw the error when checking, the question remains (for me anyway), will it update on the next release?

Think it might but, again, it's MS. Thoughts anyone?

This did not work for me - Office 2021.

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.

Great tip. I find it somewhat strange that the steps allow online Help to be accessed without issue, yet they do not to resolve the 30088-27 error.