I believe that season two of 9-1-1 has just left the Now TV service, hence why you now won't find this programme in your search. There had been a 30 day countdown with these episodes to show that they were soon to leave. It will no doubt come back at some point in the future, but hard to say at this point when that might be.
According to this link below Season 2 of 911 left the NowTV service yesterday 😠.
Never seen this show to be honest, but did you notice an orange countdown leaving date timer next to each episode or under your Continue Watching folder when using your playback device for this TV show ?