This configuration section cannot be used at this path. This happens when the site administrator has locked access to this section using <location allowOverride="false"> from an inherited configuration file.
<trustLevel name="Full" policyFile="internal" />
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Mukesh Upadhyay commented
Kindly allow us to change <securityPolicy> <trustLevel name="Full" policyFile="internal" />
</securityPolicy. So that we can use a third party tool in our web application.