Set-CsOnlineSchedule : The changes made in Schedule X are causing conflicts with other schedules in Auto Attendant Y

[sjackson0109]

Having updated National Holidays on two different spellings, covering the same country, i came across this problem:

Correlation id for this request : 41825f04-a34b-4513-a905-43945ae17645
Microsoft.Teams.ConfigAPI.Cmdlets.internal\Set-CsOnlineSchedule : The changes made in Schedule 83e774b4-eabf-478f-914e-56966515a9b3 are causing conflicts with other schedules in Auto Attendant 70561269-5dc8-485c-b125-5a75ab90ebed. Error: Holidays within an auto
attendant cannot start at the same date-time.

[sjackson0109]

Explaination We had UK National Holidays and National Holidays UK schedules both attached to a single auto-attendant.

Clearly the dates overlapped - I checked this via the GUI and it's true, they overlapped.

That isn't possible for the Microsoft Teams Call-Flow to logically process a live phone call.

Imagine the UK National Holidays action sending callers to voicemail, and the National Holidays UK action forwarding to a mobile number - for the same data/time-window. Which one would MS Teams Auto-Attendant use? Microsoft's API clealy checks for this scenario, hence the above error message is generated on Microsoft's side.

*Solution: Make sure your auto-attendants are linked to:

• One National Holidays schedule only.
• or custom closure-dates, don't overlap with national holiday dates.