[2023] Cannot update or create new manialinks through TMF player page, URL error

Hey, 
No matter what I put in the url field I get the same error "The URL of the XML file is maybe wrong." I also can't update the copper costs on already existing manialinks, since the error shows up even when I don't alter the url.
I've tried this on two separate united accounts. First noticed this a few months ago, but hadn't had a need to edit/create manialinks until now.
https://players.trackmaniaforever.com/main.php?view=manialinks: (https://players.trackmaniaforever.com/main.php?view=manialinks)