When I add a new sandbox org, the Environment Hub includes an entry for me to login to this sandbox, but SSO (Single Sign-On) is not enabled. I want to enable SSO on each sandbox org so I don't have to remember passwords for each org and don't want to set the passwords for my user on each org to be the same as this is less secure.

How can I get SSO enabled on all sandbox orgs as/when they are added to the Environment Hub ?