To set up your Office 365 email address with a domain at another company (not with ITEGY-Distinctive Technology Services), you'll need to change your DNS settings twice. Once with a TXT verification record to confirm your domain ownership, and a second time with the rest of your Office 365 DNS details to set your mail destination.
The TXT record value that you need to create is in your Office 365 account. If you need to sign back in, select Help me fix this.
Help for specific companies:
Help from other companies: