I posted this in the Alternate Names form and there was a note that I should post here in instead. Sonarr finds nothing when searching the TV show The Last O.G. (TVDB: 332439). I noticed that when I search manually on a torrent engine and leave out the periods in the title and replace them with a space - “The Last O G” - the series is found without a problem.
As mentioned, I proposed the title without periods but with a space as an alternate name and the note said that this shouldn’t be required. However, I just checked again and Sonarr still doesn’t find the show. Thanks.