Forum Discussion
iCalendar-Service with authorization with Exchange Online
Hallo,
we have an iCalendar WebService, which we want to use in Outlook with Exchange Online. Because the data are not public, we want to restrict the access for allowed users.
With basic auth (username and password) it works fine with an inhouse Exchange Server installation: here we get a dialog with the possibility to enter username and password.
With Exchange Online we don't get such a dialog. What we have to implement and/or to administrate to use our iCalendar in Outlook with Exchange Online and restricted user access?
Best regards
1 Reply
1. Confirm that the calendar is shared
Have the user log in to Outlook Web → Calendar → Sharing → Check that external sharing is enabled
2. Test the direct access link
Open the correctly formatted link in your browser:
https://outlook.office365.com/owa/calendar//calendar.ics
opens = Permissions are correct
Error = Administrator adjustment required
3. Administrator quick fix
Allow anonymous access
Exchange Administrator Centre → Recipients → Select user
Calendar sharing → Set "Anonymous users can view busy information"
4. Check organisational policies
Make sure there is no global block on calendar sharing:
powershell
Get-SharingPolicy | fl * calendar* 5 Developer solutions ➔ Calendar* 5 ➔ Calendar* 5 ➔ Calendar* 5 calendar*
5. Switch to Graph API
Register the app with Azure AD
Request Calendars.Read permission
Get data using the API:
GET https://graph.microsoft.com/v1.0/users/calendar
