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

So here comes another random fix that worked for me. YMMV

I use a little software called DoNotSpy11 to control a lot of Windows 10 less desirable activities. For kicks, I turned off this software's changes because there are settings that can affect updates and customer experience ... I restarted and low and behold, my 2024 pre-release updated like a boss....

Hi Peter SzS:

Since you use the DoNotSpy11 utility to control your MS Office LTSC Pro Plus 2024 Preview privacy settings it's not too surprising that turning this utility off and restarting your computer fixed your 30088-27 update error.

Please read my 02-Aug-2024 post on page 7 of Prius 04's Microsoft 365 Update Error 30088-27 where I noted that "The only way I can consistently stop this update error is to go to File | Office Account | Privacy Settings | Manage Settings | Connected Experiences, enable the single setting Turn On All Connected Experiences as shown below, and restart my computer (the re-boot is critical)."

Many other users have already posted that enabling this privacy setting and re-booting stops their 30088-27 update error, but this workaround does not work for everyone, including Prius 04.

I also stated in Prious 04's topic that I do not want to enable this optional privacy setting because I do not want any MS Office documents or emails syncing with OneDrive (the image below shows OneDrive appears as a connected service when File | Office Account | Privacy Settings | Manage Settings | Connected Experiences | Turn On All Connected Experiences is ENABLED), so this workaround is not a viable solution for me.

Dell Inspiron 15 5584 * 64-bit Win 10 Pro v22H2 build 19045.4651 * Firefox v129.0.1 * Microsoft Defender v4.18.24070.5-1.1.24070.3 * Malwarebytes Premium v5.1.7.121-1.0.5002 * Macrium Reflect Free v8.0.7783 * Microsoft Office Home and Business 2019 C2R Version 2407 / Build 17830.20166

Yep, this is strange all right. I can't see any significant difference in our setups except for language and subscription v standalone.

Just fascinating. For another data point (or two), I did exactly the same updates as you on two desktop (11 year old, i7)) machines both running W10 Pro and MS 365. Other than Windows Defender I have no other security software (nor anything unusual installed). Both machines connect via ethernet to a router which, in turn, connects to an ONT. I have changed nothing in my HW setup in a long, long time.

I have a 12 y.o. desktop machine (i5-3450), 16GB RAM, Win 10 Pro and Office 2021 Pro Plus, no security software othen than Windows Defender, the machine is connected via ethernet to a router that connects to the internet using FTTC (Fiber to the Cabinet) technology (copper to the cabinet, then fiber). I am Italian so I'm using win and office in Italian language, This is the "You're up to date" message (in Italian = "Il sistema è aggiornato").

So, when you manually check for updates in Office, you're now seeing the "You're Up to Date" Message?

Exactly

Just fascinating. For another data point (or two), I did exactly the same updates as you on two desktop (11 year old, i7)) machines both running W10 Pro and MS 365. Other than Windows Defender I have no other security software (nor anything unusual installed). Both machines connect via ethernet to a router which, in turn, connects to an ONT. I have changed nothing in my HW setup in a long, long time.

So, when you manually check for updates in Office, you're now seeing the "You're Up to Date" Message?

Exactly