Impersonation can't work if the group doesn't have an owner so you may see this error, to fix this follow the instructions from the Microsoft support pages: 

https://support.microsoft.com/en-us/topic/assign-a-new-owner-to-an-orphaned-group-86bb3db6-8857-45d1-95c8-f6d540e45732?ui=en-us&rs=en-us&ad=us