Following is the process for E verifying ITR through Aadhar OTP:
Income Tax Login - E file - Income Tax Returns - E verify return
On the e-Verify page, select I would like to verify using OTP on a mobile number registered with Aadhaar and click Continue.
On the Aadhaar OTP page, select the I agree to validate my Aadhaar Details checkbox and click Generate Aadhaar OTP.
Enter the 6-digit OTP received on your mobile number registered with Aadhaar and click Validate.