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

All on-line UPDATE functions work, but Office and we are blaming IP settings, DNS, etc. We can update everything with no issues so clearly this is in your end.

We can set any DNS but if you are the one with DNS issues, we are wasting our time.

In any case, your suggestions did not make a dent. Issue persists

MS 365 here and same exact issue on 2 machines.

MSFT needs to provide a fix as all other suggestions and workarounds fail. I am loathe to revert to a previous build due to the prospect that I could wind up with the same result after that previous build is updated (again).

Please provide a fix for this issue, Microsoft. Also, spare us the useless suggestions since this is clearly something YOU need to rectify.

I also see this 30088-27 error on Office 2016 and 2019.

It is introduced after the update to build 17726.20126

Restoring the previous build fixes the update error.

Not only they must provide a FIX, they MUST provide an alternate way to update Office in the meantime as we all know what happens when Office gets stupid.

I have multiple PCs in the customer's LAN, not all present the issue. Remote notebooks are also presenting the same issue, so, please, do not mention DNS any more.

1. Disable Microsoft Office Updates (File/Account/Update Options and select the Disable Updates option)
2. Open an administrative command prompt and then enter the following command:
   "C:\Program Files\Common Files\microsoft shared\ClickToRun\OfficeC2RClient.exe" /update user updatetoversion=16.0.17726.20160

An Office update window appears, let it end, close it and that's all.
If you want you can enable the Updates option again but at the moment it's still not working from there.

Until Microsoft fixes it, when you know the build number of the next update, just run the above command with the new build number and you can always update Microsoft Office simply and easily.

Don't go back to a previous version as someone (from Microsoft as well) is saying, don't you think about the security vulnerabilities that doing this will become exploitable again?
I prefer getting the very latest version then wait for a fix by Microsoft.
The latest version at the moment is: 16.0.17726.20160, this post refers to this version. If and when a newer version comes out and if they still haven't fixed this bug, just run the command above replacing the build number with the latest build number you can get from the page containing the Office version builds.