Bookings' one-time email verification code not working properly

Hi, everyone. I'm using Microsoft Bookings to make a reservation system. I enable the "Require a one-time password to create bookings" option, but it always wouldn't work when the user makes a reservation for the first time(even if the user has made reservation before, it's not working for siad user after a certain peroid of time). This problem can be reproduced consistently by opening the booking URL with incognito mode, which leads me to believe it has something to do with browser cache or cookie. Any idea how to fix this?

Thanks!

Best regards,

Steven