Keep the previous DNS values and provider access, avoid deleting the former service during propagation, document the change time, and restore the prior authoritative records if health checks fail.

Source checked 11 August 2026: Microsoft 365 official documentation.

Microsoft 365 — Start in https://learn.microsoft.com/en-us/microsoft-365/admin/setup/add-domain. Add the custom domain in Microsoft 365 admin, verify it with Domain Connect or TXT, then publish the records required for the services you enable.

Source checked 11 August 2026: Microsoft 365 official documentation.

Monitor DNS answers, HTTP status, redirect chains, TLS expiry, canonical tags and mail authentication separately. Alert on changes at the authoritative nameservers, not only a local resolver.

Source checked 11 August 2026: Microsoft 365 official documentation.

Microsoft 365 — The Microsoft 365 wizard supplies tenant-specific TXT, MX, CNAME and SRV records. Use the current values shown there rather than copied examples.

Source checked 11 August 2026: Microsoft 365 official documentation.

Wildcard support and verification differ by platform. Check the current official instructions before publishing *.example.com and avoid broad wildcards when a narrow hostname is enough.

Source checked 11 August 2026: Microsoft 365 official documentation.

Microsoft 365 supports root-domain connections, but the exact record type and value depend on the product. Follow https://learn.microsoft.com/en-us/microsoft-365/admin/setup/add-domain and use the live values shown there.

Source checked 11 August 2026: Microsoft 365 official documentation.

A normal connection should require domain-control proof, not public disclosure of private account data. Use RDAP for registration data and expect lawful redaction of personal fields.

Source checked 11 August 2026: Microsoft 365 official documentation.

Add www inside Microsoft 365 and at your DNS provider, then redirect either www to the apex or the apex to www so only one version is canonical.

Source checked 11 August 2026: Microsoft 365 official documentation.

The URSY truth-spine source for Microsoft 365 is https://learn.microsoft.com/en-us/microsoft-365/admin/setup/add-domain. Check the live page before making production DNS changes.

Source checked 11 August 2026: Microsoft 365 official documentation.

Microsoft 365: Service-specific. Do not remove validation records while certificates are being issued or renewed.

Source checked 11 August 2026: Microsoft 365 official documentation.