Life Screen not activating with "Start Recording"

Sorry, not sure what you mean 'does not go live'
When you hit Start Recording, whatever you've set up in OBS as Sources and configured to display, is what will record

If one of your sources is a Display Capture, and that source is turned on/enabled, then the content of the screen (in general) will be recorded. Having multi-GPU setup can complicate matters.
The method of screen capture (be that Display, Window, or Game capture) can influence what is, and is not 'captured'
Have you read the quick-start guide: Others have found the following helpful, even if you don't game (neither do I) - the Nerd or Die tutorial video series:
 
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