Does the Maximum Failed Login Attempts control work for web portal authentication with Active Directory users? If not would there be another way to prevent AD user account lockout when using the web portal?
It seems you are referring the "Web Portal" to any end-user facing portals, such as MyDevices portal with the login page settings:
In that case, I believe it applies to AD as well. Is your plan to set a huge number for the time between login attempts when rate timing? Otherwise, it would not help much if the AD users have the policy to lock the accounts after number of failures.