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Hello everyone,
unfortunately synchronization is no longer possible. Setting up the new user profiles and setting up the new work folder on the server was not successful. Synchronization is currently no longer possible. The problem occurs with both PCs where the user works with. Can someone help?
Windows Server 2019 with Work Folder Server
Client Windows 10 Version 2004
I have already tried a "Repair-SyncShare" without success.
Always the error after starting the synchronization.
ERORR: 0x8007017c
This is a quick note to let you know that I am currently performing research on this issue and will get back to you as soon as possible. I appreciate your patience.
If you have any updates during this process, please feel free to let me know.
For information:
I have taken the following steps (without success).
The user profile on both PCs has been deleted. // A new synchronization was started without success - 0x8007017c
The sync share profile was deleted and recreated. // A new synchronization was started without success - 0x8007017c
The sync shares profile was deleted and the WF folder was deleted. Sync shares profile has just been set up. // A new synchronization was started without success - 0x8007017c
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(307.2, 70%, 39%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EC%3C/text%3E%3C/svg%3E)
Having the same issue on 20H2 here. The offending update seems to be KB4592438, which applies to 2004 as well. Can confirm that disabling on-demand file access resolves the issue.
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Can confirm that this update causes the same kind of problem ->2020-12 Cumulative Update for Windows 10 Version 2004 for x64-based Systems (KB4592438)
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It worked on my desktop computer on Windows 10 20h2. For some reason it happened on my other computer Surface Pro 7 Windows 10 Education 20h2. I tried to uninstall the update with Control Panel and CMD but there is no option and Windows says that it is using it. Is there another way or I have to format my C drive? Is there a way to uninstall the update with the Windows install USB disk?
Sorry, I am not familiar with Windows 10 Education. I would think the uninstall process for updates would be the same.
Try uninstalling it from command prompt (as administrator):
wusa /uninstall /KB:4592438
I tried it still the same thing I guess I will reinstall windows. Then Thanks for the help! :) 
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YES after uninstalling: wusa /uninstall /KB:4592438 the problem was solved.
Please Microsoft repair this issue!
YES after uninstalling: wusa /uninstall /KB:4592438 the problem was solved.
Why does Microsoft have such poor quality control?!
The problem should definitely have been noticed in the internal quality controls !!!!
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(246.4, 67%, 33%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EC%3C/text%3E%3C/svg%3E)
We experience the same issue after installing KB4592449 on Windows 10 1909. After uninstalling the KB Work Folders work again.
We opened a case with Microsoft: 120121625000299. If someone else opened a case too please share the case number.
did you guys get this fixed? We got the same problem and the only solution was to remove the update
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(233.6, 44%, 32%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EEG%3C/text%3E%3C/svg%3E)
Another update : Found a client already upgraded to Windows 10 2004, the update is not present (probably included in the build already) but the issue is the same.
So bottom line seems to be : somehow this KB4592449 update AND newer Windows 10 build completely broke work folders with on-demand access :(
KB4592438 is the offending update on 2004 and 20H2
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Thanks working correctly now. I know can get back to my work. That was frustrating.
An "interesting" update. Every attempt to fix this fails, EXCEPT... To disable "on-demand access". As soon as I do that, sync starts working fine again, in both directions (wheter I create a file on the client, or on the server).
PROBLEM IS... Disabling "on-demand access" is not a useable solution, at least for me... Will generate a big traffic storm, plus some people have much more server storage than what they have on their client, so it will fill their drive...
So... Tested and confirmed FOR US...
On our devices, the cause for this is update KB4592449. As soon as we uninstall it from our clients, work folders start behaving again correctly.
However this update does not apply to Windows 10 2004. So it's not exactly the same scenario as yours.
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I've also created a support case on 5th of Jan but still no solution. I'll keep you posted. It maybe would help if someone with an EA can open a premier-support ticket to raise the priority.