Need help with understanding ITR filing (this could be very dumb)

I'm a college student and I have done a few internships while studying.

For my first internship (which actually was a consultant role), I recieved my stipend with the tax deducted and later my HR helped me to file for income tax return which got credited in my bank account.

Now, for my recent internship from May-Sep 2024 my stipend was 30,000 INR. No tax was deducted on it by the company and I used to receive the complete amount in my bank. Similarly for my upcoming internship, no tax will be deducted and I will be receiving the entire stipend in my bank account which is going to be 50,000 INR.

But I am receiving this message from the income tax department: "You have missed filing your Income-Tax Return for AY2024-25. Kindly file and e-Verify your ITR on e-Filing portal before 31-Dec-24. -ITDept"

I am not sure what it means. As no tax was deducted from my stipend by the source, do I need to pay the tax myself online? Also, why do I need to verify my income tax return when there's nothing to claim as I recieved the entire stipend as it is in my bank?

I don't even know what is the right question to ask. Can anyone help me with understanding what's happening?