Im an international student and filed my taxes for 2022 but I didn’t get my tuition tax refund like a lot of my friends (most got around 2k). What can be the reason.

I have filed my taxes for the first time this year through the university student union. I worked some part time jobs through the year so i got some refunded (<100).  I have been talking to a lot of my international student friends who have filed the same papers i did and a lot of them got the tuition tax refunded which is over 2000$. Whats the reason some of us didnt get that refund although we filed same papers.?