Hi, good morning, Peter,
Many thanks for your reply and prompt to revisit http requests.
After a thorough examination of both application and firewall log files, I pinpointed thirteen essential URLs for enabling Azure and SharePoint authentication.
• portal.azure.com/
• MYDOMAIN.sharepoint.com/
• login.live.com/
• login.microsoftonline.com/
• *.msauth.net/
• *.msftauth.net/
• *.office.com/
• *.cdn.office.net/
• MYDOMAIN-uat.sharepoint.com
• MYDOMAIN-my.sharepoint.com
• *.office365.com
• *.MYDOMAIN.sharepoint.com
• *.microsoft.com
After whitelisting these URLs, Web Player is now authenticating and displaying the appropriate SharePoint resources.