What is the name of the domain?
example.com
What is the error number?
n/a
What is the error message?
n/a
What is the issue you’re encountering
When using the DKIM Wizard in Email Security it creates a TXT record, M365 needs a CNAME record. Add support for CNAME for support for M365. How to use DKIM for email in your custom domain - Microsoft Defender for Office 365 | Microsoft Learn
What steps have you taken to resolve the issue?
Manual creation in DNS records instead
What are the steps to reproduce the issue?
Go to Email Security → View Records → DKIM Wizard and create record here