Help & troubleshooting for channels on your Roku device, including adding/removing channels, logging in to, authenticating, or activating a channel, channel-specific playback issues, assistance contacting channel publishers to report issues, and adjusting channel-specific settings.
Go here and click what's closest to your location. https://www.laff.com/find-us/ The stations in my region offer it over the air. I can also get Laff from my cable company via the Spectrum app. Your area might still be involved in an OTA channel "repacking" where they sold their frequency and moved to a different one. Rescan for OTA / antenna channels and see if your TV can pick up whichever local one offers Laff.