I note there are some related questions but they do not resolve my problem, searching 0x800B0100 finds them.
I have developed a UWP app for publication on the MS Store using Visual Studio 19 Community Edition and the MS Partner Centre.
In Visual Studio I have completed the package.appxmanifest and associated the app with its counterpart on the MS Store. The certificate page looks like this.
When I select "Publish | Create App Packages..." everything works fine and I get to the last screen where I have to run the WACK tests, so I kick them off.
Almost immediately, before any tests appear to have run, I get this error.
I do not know why the package is not signed. I have read lots about signing and believe the certificate is supposed to be managed by the MS Store and that when I associate the app with the store the certificate info is copied down or handled somehow. I also figured out how to create a .pfx keystore for the assembly but it doesn't solve the problem and I don't think it is needed for MS Store submissions?
Can anyone suggest what I am doing wrong.