In cases like yours when you already have published an app with valid App ID for a platform and need to maintain it, you can manually edit the AndroidManifest.xml/Info.plist and hardcode your old app ID ( for example for Android you should replace the package="$AppIdentifier$" with package="com.iwishforapp")
You would also need to edit manually the .proj file of your app to contain the problematic App ID since this is the only way to avoid our validation logic. You can push your app in a github repo and there you would see the .proj file for it. Edit the <AppIdentifier></AppIdentifier> section to contain the desired App ID i.e.
This way the build button would be enabled and you would be able to build successfully. We apologize for the temporary inconvenience, we would think of a better way to handle this for the upcoming version of Icenium.
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