So I tried out the parkour feature and I found that it didn't work for some reason? I made only a 1 block jump.

I did these commands:
(hashtag) allowParkour true
(hashtag) allowPlace false (I think it was this)

But it still doesn't work. I haven't done any others so is that a problem?
Demo: https://youtu.be/ZvT45p9ZP_0

That's because Baritone's parkour feature is still in beta. It does work, but only %10 of the time.

no...

parkour ascend was only recently added, it is not yet in any release. you can wait for the next release, or you can build baritone yourself from current source code. https://github.com/cabaletta/baritone/blob/master/SETUP.md

i assure you, parkour ascend does work, see https://www.youtube.com/watch?v=9Fb5tdsIIJc