Some advice that may help:

* Visit the console directly from another region's URL (e.g., https://us-east-2.console.aws.amazon.com/console/home?region...). You can try this after you've successfully signed in but see the console failing to load as well.

* If your AWS SSO app is hosted in a region other than us-east-1, you're probably fine to continue signing in with other accounts/roles.

Of course, if all your stuff is in us-east-1, you're out of luck.

EDIT: Removed incorrect advice about running AWS SSO in multiple regions.