Require O365 Groups to have more than one owner at creation time
To avoid the condition where an O365 Group becomes "orphaned" when the Owner leaves the company, apps that create O365 Groups should require that the creator add at least a second owner to the Group. This will prevent expiration/renewal notices from being sent to an Admin account, and increase the odds that there will be an Owner to respond and renew the group.
Thank you for your patience and feedback on this item. We are exploring few options to solve this problem. Keep the feedback coming!