During the migration of Google Groups to an Office 365 shared mailbox, you have noticed the following error:
“Fatal Error in Group Migration of [Name of Group] Error during folders binding: The specified folder could not be found in the store.
During migration, the platform will check whether the target shared mailbox exists.
If it doesn’t exist yet in your target Office 365, the platform will create it.
Sometimes there is a delay in creating a shared mailbox on the Microsoft side. So the platform tries to push your emails to the not-yet-existing object you hit the indicated error.
Normally, there is a timeout after the creation of a shared mailbox to avoid such cases.
If you have this error anyway, try to restart your migration later.