Owner e-mail is set to "firstname.lastname@example.org" in SOA DNS record when domain is created by Office365 Endpoint.
This behavior is hardcoded currently. Feature Request #APSA-18528: "Office365: "email@example.com" is owner's e-mail by default in SOA DNS records." has been adressed to Develoment team.
Contact firstname.lastname@example.org or TAM to trace the status of the request.
As a w\a SOA DNS record content could be changed manually in PCP or CCP.