I think that you are referring to something else: you don't want to change the hreflang but you actually want to change the language code that shows up in the URL. The one on the second column ("Codigo") in the screenshot that you sent me.
The hreflang is something else that gets added to the code of the website's page so that Search Engines like Google can know what language that page's content is.
Here you can find out more about what hreflang is being used for: hidden link
In regards to changing the language code from the URL, the existing language codes are reserved for the languages that come with WPML.
If you want to use a custom language code, you will need to create a custom language.
Hi there, Leo, and sorry for the delayed response - it has been a full queue for the past few days and I also don't work on the weekends so it took a while to get back to you after I checked on this matter.
From what I can see in the backend, there's no sign of the error that you showed me and on the front-end, it seems that the site loads fine on the language: hidden link
Can you please let me know if you are still experiencing this issue?
