Microsoft Bookings app not working

I've set the Bookings for my office hours a few weeks ago, and it worked fine. I have even tested with my personal account and I was able to 'book myself' a slot. 

But it just suddenly stopped working the other day. I asked my colleagues to set up office hours as I did and theirs worked fine. Anyone knows what might have gone wrong? 

As you can see, I've set it open to public for a recurring meeting on Tuesdays and Wednesdays starting from Oct. 

But nothing shows up, when I entered the site and tried to book an appointment. My colleagues also tried on their ends to book an appointment with me, but it still didn't work.