says lets keep it clean but it is clean of LFG

Not the place to put this post.

Change chp to chapter and that should solve the issue however, it might be some type of insult in a different language hence its flagging it as inappropiate

I can't see anything wrong in that text, though it's most likely the "chp" which the system is interpreting as inappropriate. Try changing the wording.

Spell out the word chapter.

Yeah the system has its flaws.

It continually amazes me that LFG won't let posts like yours through, which are perfectly acceptable....yet LFG allows people to openly advertise hacks for games including the word "hack" in it.

If I was you, I'd forget the Xbox LFG exists and use the Destiny Discord as you mentioned. The Xbox one is just not worth the effort, especially when it kicks out posts that are perfectly acceptable