Adding a .local secondary domain in CMP does not propagate over to CloudSOC
Email addresses associated with ,local domains may not be globally routable therefore are not allowed to be added as secondary domains in CloudSOC
CloudSOC tasks that requiring the system to send an email won't work.
Some examples are sending CloudSOC User a password, getting an email with link to large report, Protect policy email alerts, etc.
The CloudSOC (CASB) email validator we use marks .local domains as invalid and the reason is: