You're allowed to share a Sauce job link URL. If you're not currently logged in when you try to view the link then you'll automatically be sent to a login screen. However, our organization is set up to log in with SSO only. Our users aren't able to sign in with this prompt. It would be pertinent to check with the account who ran the job and see if they're configured with an SSO option. If there is SSO enabled on the account, then direct the user to sign in with that.