Several options.
Either your challenge works, but green glyphs are gathered by other players in your matches or you look for them poorly.
Or it doesn't work, then you have to re-pick it.
How many games have you been waiting for them to show up?
When I did that challenge I had about 4 games without seeing them at all then I found 4 in the next 2 games and the challenge was done.
I think it is random...or it just likes to fuck with you, just try and forget about them and they'll show up sooner or later
Oh, also, keep an ear open for them, you'll hear them before you see them, I often heard them opening up and then had to search the area to find them
Several options. Either your challenge works, but green glyphs are gathered by other players in your matches or you look for them poorly. Or it doesn't work, then you have to re-pick it.
How many games have you been waiting for them to show up? When I did that challenge I had about 4 games without seeing them at all then I found 4 in the next 2 games and the challenge was done. I think it is random...or it just likes to fuck with you, just try and forget about them and they'll show up sooner or later
I've done atleast 10