Go into Device mode and try all the commands to see if it's really there. It may not exist. In a lot of cases the TV mfr is still using the old IR codes that were developed before the HDMI inputs.

If you can find a command that works (another model or a pronto hex code) you can get support to add it to your account. Or if you can get it on another remote you can teach it to the harmony. If it's not available then you have to use an alternate method.

This has nothing to do with wizards - you'd have this same problem with any other universal remote as well.