Do I need to enter the frequency into a DSD+ config file somewhere? Because what I'm doing now is feeding DSD+ audio via SDR#. When I do this all I see are talkgroups, RIDs, etc. No LCN Info. like you pointed out
You don't need to enter frequencies in a file for it to say that, but you also should be using FMP24-CC.bat and 1R.bat and NOT use SDR#. I get itk, you like the looks of SDR#. But DSDPlus (Fast Lane at least) does not require any SDR sofwtare. You just run FMP24-CC.bat (if you have a dongle) and 1R.bat.
If you are running the free version, my advice ends here and you'll have to wait for someone else to assist. I don't remember if the free version has FMP24-CC.bat and 1R.bat. I don't think so. But I could be wrong.