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I sent the application for certification and the first few attempts ended with the error "A previous submission failed certification." Then the submission was successful, but the certification got stuck at the "Pre-processing" stage, attempts to cancel through the "Cancel certification" failed.
![](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(128, 8%, 22%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EA%3C/text%3E%3C/svg%3E)
Please open a free support ticket here: Contact Us. Go to Contact us, find Non-Technical Support - Dashboard and choose CHAT NOW or **
SUBMIT AN INCIDENT**. You could talk to the store team directly and confirm this behavior. The store team could check the status of your account in the back end.
![](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(64, 49%, 16%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EZ%3C/text%3E%3C/svg%3E)
I had the exact same problem and I managed to find a solution. The error was caused by the latest version (2.6.0) of the Microsoft.UI.Xaml NuGet package. After downgrading to the previous version (2.5.0) the certification run without any problems.