Azure Devops calender API not working

Hello there,
I was trying to access Azure calendar API in Postman but getting 404 Not Found error.
I am making a GET request to the following URL by changing the fields according to my organisation.
https://extmgmt.dev.azure.com/{organisation}/_apis/ExtensionManagement/InstalledExtensions/ms-devlabs/team-calendar/Data/Scopes/Default/Current/Collections/{teamId}.{monthNumber}.{year}/Documents

Ex:-

https://extmgmt.dev.azure.com/xxx-xxx/_apis/ExtensionManagement/InstalledExtensions/ms-devlabs/team-calendar/Data/Scopes/Default/Current/Collections/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.01.22/Documents

https://extmgmt.dev.azure.com/xxx-xxx/_apis/ExtensionManagement/InstalledExtensions/ms-devlabs/team-calendar/Data/Scopes/Default/Current/Collections/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.1.22/Documents

https://extmgmt.dev.azure.com/xxx-xxx/_apis/ExtensionManagement/InstalledExtensions/ms-devlabs/team-calendar/Data/Scopes/Default/Current/Collections/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.01.2022/Documents

https://extmgmt.dev.azure.com/xxx-xxx/_apis/ExtensionManagement/InstalledExtensions/ms-devlabs/team-calendar/Data/Scopes/Default/Current/Collections/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.1.2022/Documents

The organisation name and team id is correct as per requirement. I have changed the last part of the url(month number & year) for many times but still its getting 404 Not Found.

Is there anything that i have to change or I am missing ?
Thank you