Flow access was just added to our tenant 4/30. From the waffle, after successful single sign on to a sharepoint.com site, when I try to get into flow I get an error.
Correlation ID: (blank)
Error: Index was outside the bounds of the array.
I am a SharePoint, Teams, and User Management Administrator. Up toward the top right it has the right security context for myself. I set up single sign on for our SharePoint 365 tenant about a year ago. I will check with our internal network team next week to see if we have any new firewall things to allow given that the host name is not ending with sharepointonline.com.