Fixed with 27766 Workaround for “Your organization used App Control for Business to block this app” dialog in the Canary Channel

Anonymous
2024-12-16T16:39:34+00:00

After updating to Build 27764 in the Canary Channel, some Windows Insiders are reporting hitting the issue that previously impacted the Dev Channel where an “Your organization used App Control for Business to block this app” dialog is shown when attempting to use or install certain third-party apps on your PC due to an incorrect policy being enforced. The following steps should mitigate the issue:

  1. Open Command Prompt with administrator privileges.
  2. Type and hit enter: mountvol s: /s
  3. Type and hit enter: del S:\EFI\Microsoft\Boot\cipolicies\active{8E8A94F0-6EB9-42C7-A189-E018C8CF3D10}.cip
  4. Type and hit enter: del S:\EFI\Microsoft\Boot\cipolicies\active{36D62F7C-AB85-4F61-8724-744294F24023}.cip
  5. Type and hit enter: del S:\EFI\Microsoft\Boot\cipolicies\active{66D7D265-7EDD-47DD-86E4-F7C42CD55A8F}.cip
  6. Then reboot your PC.

If you are dual-booting between the Canary Channel and the Dev Channel or another version of Windows, you will need to do this workaround BEFORE booting to the other OS.

If the above steps do not work, you may need to disable Secure Boot first and follow these steps:

  1. Disable Secure Boot on your PC.
  2. You will be asked to enter your BitLocker recovery key.
  3. Log in to your PC and open Command Prompt with administrator privileges.
  4. Type and hit enter: mountvol s: /s
  5. Type and hit enter: del S:\EFI\Microsoft\Boot\cipolicies\active{8E8A94F0-6EB9-42C7-A189-E018C8CF3D10}.cip
  6. Type and hit enter: del S:\EFI\Microsoft\Boot\cipolicies\active{36D62F7C-AB85-4F61-8724-744294F24023}.cip
  7. Type and hit enter: del S:\EFI\Microsoft\Boot\cipolicies\active{66D7D265-7EDD-47DD-86E4-F7C42CD55A8F}.cip
  8. Reboot your PC once with Secure Boot still disabled.
  9. Then reboot again and enable Secure Boot.

In small cases, your PC may not boot into Windows. To get out of this state, you can follow these steps:

  1. Disable Secure Boot on your PC.
  2. Then get into Windows Recovery, choose advanced boot options and disable driver signature enforcement.
  3. Then do the above-mentioned workaround for deleting the policies after logging in.
  4. Alternatively, you can also delete the above-mentioned policies directly from the Windows Recovery console.
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  1. Anonymous
    2024-12-16T16:42:43+00:00

    👏🏿👏🏿👏🏿. Thanks for this workaround guide, Brandon!

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  2. Anonymous
    2024-12-16T18:24:38+00:00

    This worked for me

    Thank you .

    1. Open Command Prompt with administrator privileges.
    2. Type and hit enter: mountvol s: /s
    3. Type and hit enter: del S:\EFI\Microsoft\Boot\cipolicies\active{8E8A94F0-6EB9-42C7-A189-E018C8CF3D10}.cip
    4. Type and hit enter: del S:\EFI\Microsoft\Boot\cipolicies\active{36D62F7C-AB85-4F61-8724-744294F24023}.cip
    5. Type and hit enter: del S:\EFI\Microsoft\Boot\cipolicies\active{66D7D265-7EDD-47DD-86E4-F7C42CD55A8F}.cip
    6. Then reboot your PC.

    Note the first command is Type and hit enter: mountvol s:/s

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  3. Anonymous
    2024-12-16T20:34:55+00:00

    Many thanks worked for me

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  4. Anonymous
    2024-12-17T00:28:43+00:00

    You won't believe what I have been through for the last week, trying to fix this bug.

    I can't believe that it took only three lines of commands to solve this problem.

    Why does Microsoft put their users in such a terrible situation, by sending updates that affect the computer in such a way that nothing is working, and don't fix it ASAP?

    I ended my journey by buying a new laptop after I couldn't work and tried everything in my power to find a solution, with no luck.

    <Removed>

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  5. Anonymous
    2024-12-17T00:34:16+00:00

    A little too late for me. 😵‍💫

    This problem screwed up my dual boot system (on Dell XPS 8930), that had Public Build 24H2 26100.2605 on the main disk and Canary 27764.1000 on a second disk drive.

    Both systems were showing errors in device manager and various components including my Ethernet Killer E2400 were not working at all.

    I also tried a clean install of 27764 and ended up with the same issues.

    At the end I just did a clean install of 26100.1742 to get the system up and running again

    Now I have my main system using 26100.2605 public build and the dual boot on the second system with 26100.2605 in the R.P. insider channel. Everything seems back to normal after reinstalling all the programs that I had before.

    I'm not going to try 27764 again on this machine.

    I hope MS will fix this mess on the next Canary build.

    This was really a wasted weekend. 🤬🤷‍♂️

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