In CRM dashboard, when opening a Power BI embedded tile to view the report for the first time (when there  is no previous successful sign-in with no valid cookies in the browser), it has to get authenticated to power BI and requires the user to sign-in again to Power BI. After a successful sign in, the following visits don’t require to sign in again.  However, this is poor user experience and we'd like a single sign on experience... the users have already confirmed their creds for CRM dashboard and if they have permissions to the Power BI report, than they should not be required to sign in again.