I can see it... as you point out, you can only bump a thread once every 24 hours, so maybe it hadn't been 24 hours yet... I'd check again.
Thank you for your response! It's been over 24 hours, but the bump button seems to have disappeared and is no longer visible for any announcement on my end. I’m wondering if the Bitcointalk team might have introduced an update to the bump feature that I may not be aware of.
That's not the case. The only thing I can think of is if you get de-ranked, you might lose the ability to bump threads, but that doesn't appear to have happened to you. Are you sure you're looking in the right place?