I am getting this error using FTP scope FTP Scope: "Accessing a hash algorithm by manipulating the HashName property is not supported on this platform. Instead, you must instantiate one of the supplied subtypes (such as HMACSHA1.)"

I have converted our project to Windows legacy and using UiPath.FTP.Activities 2.3.0 version and getting below error message

I just had the same scenario as you, converting a project from Windows-Legacy into Windows, facing the same issue. The issue was resolved updating the UiPath.FTP.Activities from 2.3.0 to 2.4.0.