Kindly note that Microsoft Q&A forum mainly focus on Teams general usage questions, since your question is mainly related to bookings app, please consider posting in the Microsoft Bookings Community or contact consult experts for better support.
According to our research, this problem can occur for the following reasons:
- There is a difference between your Office time zone and the booking time zone. You may need to check and change your time zone settings in the Office portal and in the Bookings app.
- When you set up employee working hours, you haven't cleared the Use business hours check box. You may need to customize each employee's working hours to match their availability.
- You haven't updated your booking page after changing your hours or boundaries. You may need to refresh the booking page or clear your cache to see the changes.
In addition, this similar thread you can refer to:
Hope this helps! Moreover, if the above is not your scenario or I have misunderstood anything, please correct me and provide us with detailed information about the issue including the screenshot so that we can better understand to further assist you.
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