Resolved! Force SSO from Base URL of the Instance
Is there a way to force redirection to the SSO provider from the base URL of an instance? Use this: https://myinstance.service-now.comInstead of this: https://myinstance.service-now.com/login_with_sso.do?glide sso id=a343f9efe98fa98fef8e9d8fef9ew...