Microsoft app https://to-do.live.com/tasks/ not loading on Firefox
"Microsoft to-do" isn't loading correctly on Firefox, it's stuck on a spinning wheel, however it works on Firefox private.
I've cleared cache and cookies but this hasn't helped. Enhanced Tracking is off for this page, there are no extensions on my browser.
All other Microsoft apps work correctly, it's just this one.
What else can I try to fix this?