Booking a slot already booked

ZWalker1000 i had the chance to talk to the product team and highlighted this. 

This is the response i got, after testing this. it does in fact happen only when when you create an empty appointment from Bookings admin calendar (bookings.office.com). 

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Thanks Daniel.

This seems to be a bug and we will fix it this week and the fix should reach the production servers in about 4-5 weeks.

In the meantime, this issue happens only when you create an empty appointment from Bookings admin calendar (bookings.office.com) and later when you try to book an appointment against the same slot from self-serve bookings page.

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So great News, Fix is on the way 😉