Doesnt work

I was very excited when I found out there was an actual app to help plan out your IG feed. Upon opening the app, and after logging in, it sends me directly to a page that says "Bad Request (400)." Ive tried deleting and re-downloading the app, but it continues to do the same thing. The app doesnt work. Im extremely bummed out and hope it gets fixed.

NadiaG about Later: Social Media Scheduler, v3.1.1