Few days ago i completed fractal lvl 12 and didn’t get a bonus chest, my official level was 7 at that time. No idea why i got no chest since everyone in group got one.
Because you have a personal lvl which not allowed you to have the daily chest 10+ or more. so you need to lvl up 1st.
Fractals loots (like shard) and daily chests are related to your personal lvl.