The issue is resolved. SSO login should be working as expected.
We're confident the AWS outage is resolved, and we've also completed our own remediation steps, which include pushing a new app update and enforcing upgrade. The new update includes bug fixes to improve performance in future similar outages. Granola is now fully operational, but please do get in touch if you're experiencing any issues or have any questions, via hey@granola.so Thanks for your patience!