I solved the same problem… See Thread Codesign for mac app store error - #6 by Sergio_Tamborini
I solved (after months) dropping all certificates and generates again. @Sam_Rowlands helped me with the Apple authority certificate and he’s near to release the new AppWrapper version that fix a privileges certificates on the newer MacOs.
Anyway keep in mind that the appstore validation code must be executed before all in the open event in the app…
Hope this is helpful.