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

Had/have the same problem for my Office 2021 installation, but managed to manually update to latest version by setting Target Version in Group Policy. Another solution is to update from PowerShell:

& "C:\Program Files\Common Files\microsoft shared\ClickToRun\OfficeC2RClient.exe" /update user updatetoversion=16.0.17726.20160

But as other as pointed out the problem is still there in latest version when clicking "Update Now".

One thing to note is that in "About Excel/Word" the correct version is listed (16.0.17726.20160), BUT when clicking "About Excel/Word" the popup window shows an older version (16.0.17726.20078). Perhaps this is the culprit of the problem.

One thing to note is that in "About Excel/Word" the correct version is listed (16.0.17726.20160), BUT when clicking "About Excel/Word" the popup window shows an older version (16.0.17726.20078). Perhaps this is the culprit of the problem.

Good catch. I missed that on mine, but it is the same in Word, Excel and Outlook. I need to check the registry to see if it has something there.

Just checked. The registry shows the correct version. You may have stumbled onto something here. Hope someone with knowledge is reading this stuff.

Maybe in your case. All our customers are in 2406, Build 17726.20126 and all the Office products report the same version.

Did you click on the About Outlook button and look at the top of the box? All three of my machines show a different version there than under the About Outlook button on the Account page, though only one machine is having the updating error.

Where is Microsoft???????