Calendars disappeared after migration from Azure AD to Entra ID
Hello everyone,
Our company recently completed a migration from Azure AD to Entra ID. During this process, we noticed that for some of our group email addresses, which also have a regular mailbox, all additional calendars have disappeared – only the primary calendar remains.
During the migration, only the permissions for this mailbox were changed. Specifically, the legacy security group that was synced from AD was removed, and users were granted direct full access permissions to the mailbox.
We have all the necessary rights on the mailbox, and the calendars are not found in the deleted items nor in the folder view under deleted objects.
Has anyone experienced something similar or knows if and how these calendars can be recovered? Is there perhaps a specific process or tool to locate such calendars after a migration?
Thank you in advance for your help!