My internal mic doesn't seem to work on my (new) Dell Inspiron 7591 (with Realtek ALC3254 audio device driver) on my F32 KDE install either. I'm sorry I don't have a solution to post for you.
Because the mic on my headphones is also not working, I suspect it's because the correct linux driver is not yet available. I trust, but can't verify yet, that this is known to the developers and that they're working on it.
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