d-<myorgid>.awsapps.com/start/ logs in, then shows blank white screen

My problem is that after a successful login, I'm taken to a blank white screen (see image below) The console logs are fully visible in the screenshot, there aren't any missing logs.

I have tried Chrome, Firefox and Safari on Mac. All with the same results

More info: If I log into a google account that doesn't have access to our SSO system, I get a google SSO "you don't have access to this app." we are are making it past the auth piece it's just when the login is successful it goes directly to a white screen