Hey, thanks for everyone's replies and sharing of similar issues! TLDR: I re-imported the clip and auto-transcribed and it worked. Maybe that will work for you too. And maybe it had something to do with needed to clear the cache, because no matter how many times I've tried hitting re-transcribe on the first instance of the clip in my project, it would not separate the speakers.
More details:
- I'm transcribing a clip, not a sequence. BUT, I had first tried putting only that clip into a sequence and transcribing the sequence, so maybe that duplicate use of the clip made something weird happen?
-Also, the first time I tried transcribing the clip, I was also having five other clips transcribed at the same time. Maybe something with memory/RAM disallowed the separating of speakers?
Clip details:
This is a 1 video/audio track clip. It's around an hour long and recorded over Zoom, so the audio quality isn't the best. However, I've auto-transcribed around 20 other Zoom videos of the same length through Premiere without an issue (before Version 23.4). I always ensure "Identify Speakers" is enabled and the speakers in the clip that is giving me trouble have very distinct voices, so the program should have been able to tell them apart. In the past, even with two similar female voices, the transcription software in Premiere was able to distinguish between the two.