Cool if ou want to just show it to a class, to show how transverse flutes work, blowing over the hole, but sounds terrible and is hard to get clear notes out of it

I was blowing clear notes and could play 2 octaves.

Once the intonation issue was corrected the instrument became very easy to play and it is very easy to produce a good clear note.

I was blowing clear notes and could play 2 octaves.

take your time, remember how you held it when you get a good note and then practice.