We've implemented Azure SSO successfully and we have tested logging into SmartSheet via the option. However we have been seeing inconsistencies with the login page.
When we test with admin id, it regularly shows the "Sign in with your company account" option after entering the email address. But when we tested it with other users, either the option would show up only have the time, or for others it would not show up at all.
It would not seem to be our configuration since the admin gets the option and others get the option sometimes. But I'm not able to identify a root cause why the option is only occasionally showing, ever after clearing caches on the browsers.
And if any of the admins are going to suggest we open a ticket, we did that and they sent us here.