I'm simply taking a guess here but it doesn't look like your authentication is turned on. I see both your NTLM and LDAP authentication are disabled. If it can't authenticate, it will not be able to know who is in the list of allowed users for override.
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For this to work, MWG needs to think that the user who is attempting to override, is "not authenticated" otherwise they will be allowed to override.
To have this work as you so desire, create a rule above "Redirect after authenticating for AuthOverride", use the following for the rule info:
-Name: Allow only authorized users
-Criteria: Authentication.Username is not in list [Authorized users for override]
-Event: Authentication.IsAuthenticated = false
Afterwards, remove the additional username based criteria you have added to "Redirect after authenticating for AuthOverride".
Let me know if this helps,