Issue Summary
I tried to plan an appointment for a customer in a free slot. So the slot was selectable and after filling in all the necessary fields it returns (translated from Dutch): "The appointment could not be booked. No available users found. Can you try another time slot?"
Steps to Reproduce
- Click on an empty slot
- Book an appointment
- Get the error
Actual Results
The appointment can't be booked although it is being booked in a free slot, which is also free in the actual Proton calendar.
Expected Results
I expect the appointment to be booked.
Technical details
- Chrome Version 139.0.7258.139 (Official build) (64-bits) with Proton calendar
Evidence
Screens:
September 11th 13.00 is available in calendar:
Slot can be booked on Cal:
Availability shows it as blocked:

Issue Summary
I tried to plan an appointment for a customer in a free slot. So the slot was selectable and after filling in all the necessary fields it returns (translated from Dutch): "The appointment could not be booked. No available users found. Can you try another time slot?"
Steps to Reproduce
Actual Results
The appointment can't be booked although it is being booked in a free slot, which is also free in the actual Proton calendar.
Expected Results
I expect the appointment to be booked.
Technical details
Evidence
Screens:
September 11th 13.00 is available in calendar:
Slot can be booked on Cal:
Availability shows it as blocked: