Ustadh i dont understand this, the face of a woman is awrah and should be covered but why isnt it allowed to pray with the niqab then? Or did i understand it wrong because of my big ignorance? Barakallahu feekum

Because covering the face is for foreign men. As for prayer, she covers herself and shows respect, modesty, and honor. She doesn't take it lightly or just pray in whatever she happens to be wearing. The people of Ilm have even mentioned that a man, when he prays, should also wear something that is good and appropriate, even if he is praying alone at home. This is because it shows honor for the worship itself and for standing before Allah.