Problem: You are trying to change the Japanese URL on your website to https://navagis.com/jp/. Solution: Modifying an existing language code is impossible, but you can create a custom language and specify the code as /jp/ For detailed instructions on how to add a custom language, please visit Editing WPML's Languages Table.
If this solution does not apply to your case, or if it seems outdated, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If issues persist, please open a new support ticket at WPML support forum.
