As-salāmu ʿalaykum Ustadh, I recently realized that in Sūrah al-Fātiḥah I have been reciting "أن أعمتَ عليهم" instead of "أنعمتَ عليهم" — pronunciation difference didn't seem that huge. Do I need to repeat the prayers that I performed like this? I’m not sure how many prayers I recited in that way.

Ustadh AbdulAziz al-Haqqan

I have already answered this question may Allah reward you, if you did what u could to learn and it is difficult for you then there is nothing on you in sha'a Allah.