Question about how to use CryptoKeySecurity class

Hi there, I am new here. I have a question about how to use CryptoKeySecurity class under Xamarin.Form. I understand that CryptoKeySecurity class should be there at namespace "System.Security.AccessControl". And my code can work perfectly under a windows form project, but when I use it in Xamarin.Form project, vs2019 just can not find the CryptoKeySecurity class under namespace "System.Security.AccessControl". Could anyone help me with this situation? any other "using" should be used or any other NuGet package should be installed in order to use CryptoKeySecurity class?

thank you so much for your help!