"KB4023057 <install>" appears each time I check for updates

Hi, first, a simple point- don't keep manually checking for updates. There's no need- Windows does this automatically- so you can be doing something useful.

Second, this is the thread on that KB from the News section- about what it is - and please feel free to read the pages of comments for similar experience.
KB4023057 Windows 10 and Windows 11 Update Service components - Oct.27

It is an ongoing update which is updated on an ongoing basis, if you see what I mean.

Third- the MS page:
https://support.microsoft.com/en-gb/...1-7e392450fb3a

Note a secton there about what may stop it being deployed:
- there's a service to check, and...

You might have to allow the following endpoints if they are blocked in the device's firewall settings, or an upstream firewall:
*.blob.core.windows.net port 443
deploymentscheduler.microsoft.com port 443
Devicelistenerprod.microsoft.com port 443

If your tenant is in the EU region:
devicelistenerprod.eudb.microsoft.com port 443

Feel free to try
Reset Windows Update in Windows 10

it is missing from <installed updates>

I see this update listed in my Update History, not under Control Panel, Installed Updates.

But as said below, as Microsoft Update Health Tools, under Programs and Features.

I see KB4023057 in Update History.
I also see "Microsoft Update Health Tools" in Control Panel > Programs and Features (which is the same thing).


And, as mentioned above... this is a recurring update. It pops up about every month or two, and has been since February 2021.

erpster4 said:

and that update gets "revised" from time to time without notice

Yes it does.

Ghot said:

Yes it does.

I'm on my Win11 just now and got that KB back in Sept. '23 and again in Nov. '23.

Berton said:

I'm on my Win11 just now and got that KB back in Sept. '23 and again in Nov. '23.

Yep. It pops up every month or two.

It's probably a bit like the Definitions update for Microsoft Security/Windows Defender, same KB number but version updates.