Look for the corresponding POST (or GET) interactions. With the 'Network' tab selected -step (1)- generate some traffic against desired calendars (eg: create a dummy appointment). The steps are depicted on the below screenshots which show the web debugging console below the iCloud calendar page. To determine the relevant parameters, first logon to your account on, then launch the Firefox web debugging console ( F12). The format of an iCloud caldav URL is as follows: In particular how to determine the complete caldav URL by substituting the XXXX above.Ĭredit for my answer is due to this blog post (note: I use Thunderbird/Lightning as my caldav client but this is irrelevant). Once the delegate has been successfully removed, click Done.The answer by the OP is very useful but it's missing some key pieces.

Locate the delegate you'd like to remove and select them.

Once the permissions have updated, click Done.

Locate the delegate you'd like to change permission levels for and select them.

Once the delegate has been successfully added, click Done.

In the Calendars column, change the permission to the desired level needed.

Select the name and e-mail address that matches that person.

Click the + symbol and type in the first and last name of the delegate (user) you'd like to share your calendar with.

Click on the Accounts tab, and make sure your Office365 account is selected on the left.

Click Calendar in the menu bar, then select Preferences.

Read & Write: Allows the user to both view events as well as create, delete, and edit them, regardless of who created the event.

The user can edit or delete events they created, but cannot edit or delete events created by someone else.

Read & Create: Allows the user to view events as well as create them.

Read Only: Allows the user to view events in your calendar.

Please see for instructions on how to do this. To do this, you must use the Outlook Web App. Note: Apple Calendar does not support the ability to add delegates that are not within the Microsoft 365 system. You can give a delegate (user) access to your calendar and you can set permissions that define the activities that delegates can carry out for you.

Thunderbird icloud calendar