FYI for any Googlers - On the "Sorry, Gemini advanced isn't available for you" page, clicking "Learn More" gives you a (presumably internal) SSO sign-on (links to https://support.corp.google.com/googleone?ai_premium)
Edit: no it's black history month... Kinda strange
>On the "Sorry, Gemini advanced isn't available for you" page, clicking "Learn More" gives you