How can I active again my windows defender? Ann error message showing your This setting is managed by your administration

[MD Sajid Chowdhury Sahil]

My windows defender showing me an error message like "Page not available, your it administrator has limited access to some areas of this app, and the item you tried to access is not available. Contact IT helpdesk for more information" and I can't turn on real time protection option because it's shows a warning message like "This setting is managed by your administrator. How can I activate it again?I already tried to edit registry file for windows defender but in my registry file there is no windows defender file also in Service option there is no Windows defender protection service file found.

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