I'm the owner & operator of a server which is also used for sending e-mails.
While each & every other e-mail provider I know off succeeds in receiving mails, Enterprise Outlook customers fail to do so, moving mails from my server into their spam folders (or "Junk E-Mail" as Microsoft calls it) - which happens, because SPF validation succeeds, but DKIM fails.
However, all my relevant DNS records (SPF, DKIM & DMARC) are not only valid, but any other provider (GMail, Yahoo, etc.) report that valid state back to me everytime.
Additionally, online DKIM validators & even tools suites like mailhardener.com, report 100% conformity of my DNS records as well as my mail server's configuration with SPF, DKIM & DMARC configuration rules.
Now, while Microsoft sends out "DMARC Aggregate Report" mails, the mentioned feedback address, dmarcreportfeedback [-AT-] microsoft [-DOT-] com, neither accepts mails (always reports "550 5.4.1 Recipient address rejected: Access denied.") nor does feedback every get a reply.
Furthermore, the mentioned DMARC report from Microsoft fails to comply with yet another DMARC standard's request for providing a reason upon validation failure.
All I got was this XML, contained within the report's attached GZ archive: