rdp decryption over ssl

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I have a piece of software that sends keystrokes over RDP using SendKeys, but currently it isn't working and I want to know why. I have access to both client and server encryption keys, so the plan was to decrypt the session and see what is being sent, and why it fails, but when I go to configure the RSA keys list, I get the following message:

While 'rdp' is a valid dissector filter name, that dissector is not configured to support ssl decryption. If you need to decrypt 'rdp' over ssl, please contact the Wireshark development team.

What are my options here? Can this be achieved?

Thanks for any assistance.