UWP app -Invalid package family name, after update certificate

I created app for uwp (win 10 desktop). I could not build package for store. I received an error: it is necessary to update the certificate. I have updated certificate and build my package. But when I upload the package to the store, I get the error:

Invalid package family name: MyPackage.xxxx_xxxx (expected: MyPackage.yyyy_yyyyy)
Invalid package publisher name: CN=XYX (expected: CN=xxx-xxxx-xxx-xxxx)

But I opened my app manifest and I see:

Published: CN=xxx-xxxx-xxx-xxxx
Package Family Name: MyPackage.yyyy_yyyyy

It is what expected. In "open sertificate" I see : Publisher -XYX.

How do I fix it all? Any ideas?

I solved this issue. I made a mistake when creating new certificate. It must be so:

1. Open Package.appxmanifest.
2. Go to the "Packaging" tab.
3. Copy Publisher DN(number after CN=)
4. Click the button "Choose Certificate" and select the item "Create test certificate..."
5. Copy the publisher DN from step 3 to the first editable text field