This domain needs to be the one which belongs to the Business, which is, this domain really should be the just one you've got registered with Microsoft 365. For more information, see Add a domain to Microsoft 365. You may as well pick API in the event you wanna https://ftp-server-install00099.dsiblogger.com/59349955/5-tips-about-anti-spam-filter-you-can-use-today