@PM Thanks for posting in our Q&A.
As far as I know, CSP settings is available on Windows 10 1703 and above.
According to your requirements, the OMA-URI configuration is as follows, please confirm if there are any errors.
OMA-URI: ./Device/Vendor/MSFT/Policy/Config/Settings/PageVisibilityList
Data Type: String
Value: showonly:network-wifi;network-proxy;bluetooth;display
If there is no problem with the above settings, we can try to assign the profile separately to an enrolled device, check the Device status to see whether the profile has been applied successfully. For related links, please refer to: https://video2.skills-academy.com/en-us/windows/client-management/mdm/policy-csp-settings#settings-pagevisibilitylist
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