When you attempt to publish a paid Android app that is available in multiple countries you receive the following error message:
Unknown validation VALIDATE_APP_MESSAGE_MISSING_COUNTRY_PRICES and you would like to know how to resolve it.
- Navigate to App Pricing in the Google Play Console
- Click Edit Price
- Click Update Exchange Rates
- Click Save
- Navigate to Releases
- Click Review and release
After performing these steps you are able to publish your app without encountering this error.