We created a new Azure AD connection with the /api/v2/connections endpoint, and we are seeing logins fail and we are taken to a Microsoft login error page:
'Sorry, but we’re having trouble signing you in.' However, after hitting the Save button on the connection settings page in the Dashboard, logins are successful.
During the initial request to POST /api/v2/connections when you create the new connection, replace the options.domain property with the options.tenant_domain property and set it to the same value. This will allow logins to work without needing to go to the Dashboard UI and save the connection.