Enable Conditional Access for Intune Company Portal Web Site
Enable Conditional Access for Intune Company Portal Web Site (portal.manage.microsoft.com)
The website is available for Intune users to view their own devices info and execute remotte actions such as wipe, sync and passcode reset.
Admins want to restrict access to these features from outsiders or non-compliant devices so that only compliant devices and users can execute actions.
Access is already controlled, because users have to authenticate to access the web portal, so only authenticated users can execute actions. And the portal is how users can tell if a device is compliant and if not, what remediation to do. So I'm not sure what threat you're trying to mitigate with this.