Problem: You want to change the country code shown in the permalink for Malay from /ms/ to /my/. Solution: We use language codes, not country codes, which is why it shows as /ms/. Unfortunately, you cannot directly change language codes. However, we recommend you try creating a custom language and assign the language code "my" to it. You can find detailed instructions on how to do this here.
Please note that this solution might be outdated or not applicable to your specific case. 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 this does not resolve your issue, please open a new support ticket.
