So show us the actual code that gives you the error. Otherwise we cannot help you.
Or have WinSCP GUI generate valid code for you:
https://winscp.net/eng/docs/ui_generateurl#code

No, that was just an example. In the script it is good.

This part is wrong:

Hi,

I am trying to populate the SshHostKeyFingerprint option and it is stating:

New-Object : The value supplied is not valid, or the property is read-only. Change the value, and then try again.

Is this because I am writing it in a wrong format (example below) or am I missing something out?

Thanks