We’re working on the ability to change the SharePoint site URL associated with an Office 365 Group.
To change the email address of the group, follow the best answer here: https://answers.microsoft.com/en-us/msoffice/forum/msoffice_o365admin-mso_exchon-mso_o365b/how-to-add-an-email-alias-to-an-o365-group/79d94383-442a-4e3a-ac62-4ff1ea8af962.
We’re working on renaming the Team Site. Stay tuned.Steven Palmo commented
Thanks for working on this. Absolutey crucial as Office 365 groups will definitely get renamed especially when/if groups are based on departments, divisions, teams and those always change. When some parts of the 365 does not reflect the 365 group name change, it just acts half-baked