Set working hours start/end time w Powershell does not work

Question

Set working hours start/end time w Powershell does not work

MrtnMrkn 0

Hi

I try to set working hours start and end for one (later for all) users.

Powershell says it works, but the Outlook calendar for the user does not change from the default 8-17. Namnlös

User's calendar after about 48 hours:

Namnlös2

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Answer 1

Nam-D 730 Microsoft External Staff Moderator

Hello @MrtnMrkn,

Welcome to Microsoft Q&A forum.

After reviewing your description, we understand that you are experiencing an issue where running PowerShell does not update the Outlook Calendar, even though the command executes successfully and displays the correct result when using Get-MailboxCalendarConfiguration. We have tested the same command you are using to update the calendar working hours, and in our case, there was no issue. The update reflected immediately in the UI after completing Set-MailboxCalendarConfiguration. Could you kindly confirm the following:

Are both Outlook Desktop and Outlook Web showing the same behavior?
If using Outlook Web, please test in an InPrivate window (Edge) or Incognito window (Chrome) and check if the calendar reflects the updated value (end time set to 16:00).
If the update does not appear, please try again with another user account and confirm whether the issue persists.
Kindly let us know which license type your company is currently using (Business Standard, M365 E3...)

Thank you for your cooperation, and we look forward to your feedback.

If you have extra questions about this answer, please click "Comment".

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Nam-D 730 Reputation points Microsoft External Staff Moderator

2025-12-08T08:36:33.5833333+00:00

Hello @MrtnMrkn,

Would you please get back to me at your earliest convenience? Your response is important for continued troubleshooting. If you need further help, please provide more detailed information so that we can offer more accurate suggestions.
MrtnMrkn 0 Reputation points

2025-12-09T13:19:44.4366667+00:00
@Nam-D Thanks, and sorry for the delay; I didn' get a notification that there was an answer.

Are both Outlook Desktop and Outlook Web showing the same behavior?

Yes

If using Outlook Web, please test in an InPrivate window (Edge) or Incognito window (Chrome) and check if the calendar reflects the updated value (end time set to 16:00).

No change

If the update does not appear, please try again with another user account and confirm whether the issue persists.

Same issue with all tested accounts

Kindly let us know which license type your company is currently using (Business Standard, M365 E3...)

Business premium
Nam-D 730 Reputation points Microsoft External Staff Moderator

2025-12-10T08:26:07.3266667+00:00
Hello @MrtnMrkn,

Thank you so much for your update. Since this appears to be a UI-related issue, we highly recommend reaching out directly to our Microsoft Support team. They can perform a detailed investigation, run diagnostics to identify/narrow down the issue and apply the necessary fixes. If required, the case will be escalated to our Outlook backend team to ensure the UI is corrected and data synchronization is handled properly.

Please understand that as a Microsoft moderator, we have limited access to resource.

To submit a new service request to Microsoft Support, you will need to:

Go to the admin center at https://admin.cloud.microsoft.

On the bottom right side of the page, select Help & support.

Please follow the structure below and select "Contact Support". Then, choose contact method: "Phone" or "Email"

Enter a description of your issue, confirm your contact number and email address, select your preferred contact method, and then select Contact me. The expected wait time is indicated in the Contact support pane.

Please help us to attach the screenshot of the result of PowerShell and from Outlook UI to the request so that they can support you easier and faster.

Note: Only Global Administrator can access Admin Portal and submit a support ticket. If you are an end-user, please contact your IT admin to do this for you.

Hope you understand for us about this situation. Thank you very much.

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Set working hours start/end time w Powershell does not work

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