Same ordeal regardless of account or permissions. All I've been doing is as a domain admin. If I clear out all the settings, open spark, all fields are blank, and set it to SSO and DNS, it immediately and properly pulls in the username and account as it should. I never got it to work via krb5.ini files but I can manually specify the realm and kdc and it pulls the user and account properly as well. When you login it still throw a "Login error: Unable to connect using Single Sign-On. Please check your principal and server settings."
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