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.J Yates commented
When creating a dynamic office 365 group from Azure AD the Sharepoint Team Site URL will not use the name of the group, but instead the GUID which is undesirable. We either need a method to change and add a redirect or address in the Azure AD group creation script.
1,591 votesJ Yates commented
When creating an azure AD dynamic Office 365 group, the URL is the unique ID of the group (which is a GUID), which doesn't make sense. It should be the name of the group. This would be a use case to change the URL
We have announced that Group Owners will be able to leverage existing groups to drive membership in Office 365 Groups.