Using New Outlook on Windows for professional communication and productivity
Run the below in ExchangeOnline PS to check, if both is False it is still there.
Get-ReportSubmissionPolicy | Select-Object -Property Name,EnableThirdPartyAddress,EnableReportToMicrosoft
Run the below cmdlet to enable the third party address, This must be enabled.
Set-ReportSubmissionPolicy -Identity DefaultReportSubmissionPolicy -EnableThirdPartyAddress $true
Run the below to disable ReportToMS , this must be false.
Set-ReportSubmissionPolicy -Identity DefaultReportSubmissionPolicy -EnableReportToMicrosoft $false
Worked for us.
Then run the first cmd to confirm. You can also check on the web interface. MS needs to fix the coding in the webUI.