Why is DMARC, DKIM, and SPF failing at custom domain in Office 365

Third party used for DNS and web hosting. Third party has valid SPF, DKIM and DMARC records. Authentication section of email headers on received email indicates “pass” for SPF, DKIM, and DMARC. Dmarcian reports valid DMARC but no DKIM Signing. Outlook email results show failed SPF, failed DKIM and failed DMARC.
Also, numbers reported do not add up to expected totals.
Any Thoughts?