Outlook Certificate Errors 0x80072F0D and 0x800B0109: Untrusted or Mismatched SSL
Outlook 0x80072F0D means the server certificate is untrusted, expired or has the wrong name. Fix the chain, the SAN entry and the system clock.
Office 0x80072F0D: TLS inspection is breaking Office licensing calls
Error 0x80072F0D means Office rejected the certificate presented by an inspecting proxy. See how to spot it and how to exempt the licensing hosts.