Forum Discussion

Copper Contributor

Jun 10, 2022

Solved

Attempting to install a created App Package fails with error code 0x8000FFFF among other issues.

After creating an App Package from a WinUI 3 project, attempting to install it using the created .msix file results in the error code: 0x8000FFFF. Installing the application using "Install.ps1" and e...

C Sharp

WinUI

Roy_MacLachlan
Jul 13, 2022
Hi BR_Red_Panda,

My initial thoughts on this, is that there is an issue with the certificate used to sign the app. But as you've confirmed, the Certificate has been installed on the system. I'd also like to confirm that it is installed in the Trusted People certificate store?

If it is, please submit a feedback hub submission by pressing [Windows Key]+[F], recording your install experience and then after submitting it, please share with me in this post, or in direct messaging information about the feedback item.

Roy_MacLachlan

Microsoft

Jun 20, 2022

Hi BR_Red_Panda,

Thank you for reaching out regarding your issue concerning the creation of an MSIX packaged app using the WinUI 3 project.

With regards to the error you are receiving with the install, can you confirm that the MSIX packaged app has been signed using a code signing certificate that is trusted by the device?

BR_Red_Panda
Copper Contributor
Jun 23, 2022
Roy_MacLachlan, Yes, I created and installed a certificate as part of the packaging process.
- Roy_MacLachlan
  Microsoft
  Jul 13, 2022
  Hi BR_Red_Panda,
  
  My initial thoughts on this, is that there is an issue with the certificate used to sign the app. But as you've confirmed, the Certificate has been installed on the system. I'd also like to confirm that it is installed in the Trusted People certificate store?
  
  If it is, please submit a feedback hub submission by pressing [Windows Key]+[F], recording your install experience and then after submitting it, please share with me in this post, or in direct messaging information about the feedback item.