Yes, you will need the Microsoft 365 administrator to check this. The group calendar is stored in the group mailbox, so without admin access you won’t see recovery or detailed status. Ask your admin to:
Sign in to the Microsoft 365 admin center.
Go to Teams & groups > Active groups.
Locate your group and check if it is active.
If the group was deleted, restore it within 30 days from Deleted groups.
If the group exists, verify the group mailbox and calendar settings.