Be able to use a different email address than is currently associated with a given SSO user in Terraform Cloud
At present, there is no way to change the email associated with a given SSO user in Terraform Cloud.
In order to change the associated email address of a user, it is necessary to contact Hashicorp Support with a list of user/email address associations to be removed. The user can then sign in with the new credentials and recreate their login.
If you have additional questions, please open a support ticket with HashiCorp Support.