I’m currently working on fetching the list of groups using app-only permissions and accessing group calendars using delegated permissions. However, I am facing limitations where I can only fetch public groups and some private groups where the delegated account is a member or owner. My goal is to fetch all group calendars within my tenant.

Here is my setup:

I am using app-only permissions to fetch the list of groups.
I am using delegated permissions to access group calendars.
I am a global administrator and using my account for delegated permissions.
Issues:

I can only access public groups and some private groups where my account is a member or owner.
I need to fetch all group calendars across my tenant, regardless of my membership status in those groups.

Is there any way to fetch all the group calendars in my tenant using delegated permissions or any other method?

Any help or guidance would be greatly appreciated. Thank you!