Hello,
Thanks for contacting us. Sorry for the delay and any inconvenience that might have been caused due to that.
We have been trying to collaborate with them for a few years but left the conversation when they refused to add the compatibility even though they have it for several other plugins (some of them have a smaller user-base compared to RM)
https://github.com/polylang/polylang/tree/master/integrations
You can check their public repository where we created a pull request (linked to from your opening post) a few years back and we would have maintained it (though that would not have happened ideally since we do not make changes in the plugin that breaks the compatibility).
Disappointingly, the compatibility needs to be added in their plugin as they added for other SEO plugins. We are more than committed to making that happen and always keep it updated, of course, if their team agreed and wanted to collaborate.
With that said, you can check the following page for alternatives that are 100% compatible with the Rank Math SEO plugin
https://rankmath.com/compatibility/
https://rankmath.com/compatibility/?s=Translate&post_type=rm_compatible
Hope that helps. Let us know if you need any other assistance.
Thanks for the explanation Jeremy, Appreciate it!
Hello,
We’re delighted to be of assistance. If you have any other questions in the future, know that we are here to help you.
If you don’t mind me asking, could you please leave us a review (if you haven’t already) on https://wordpress.org/support/plugin/seo-by-rank-math/reviews/#new-post about your overall experience with Rank Math? We appreciate your time and patience.
If you do have another question in the future, please feel free to create a new forum topic, and it will be our pleasure to assist you again.
Thank you.