Outlook Add-in throws error while performing action in NEW Outlook (mac/windows)SummaryOutlook Addin not working with new Outlook / 365InstructionsWith new Outlook we are seeing this error due to cross domain access for frequently which we did not see much with old outlook client. The fix is to verify the sys_response_header entries in the instance. If the instance contains "Global" scoped sys_response_header record, with "All pages" and value of that record contains only "teams.microsoft.com" the fix is to append "https://outlook.office365.com https://outlook.office.com " in the same record. See screenshot