Verify who is asking
Check the email on file or a detail only the account holder knows before resetting anything.
Send a reset, not a password
Never send a password in plain text. Send a reset link or a one-time code.
Check the common causes
Wrong email, an old account, a school address that changed, or a locked account after several tries.
Offer a fallback for deadlines
If they are about to miss something, tell them how to submit another way while you fix access.
Fix the cause in your help centre
If the same ticket repeats, add a short article and link it in your reply.