Trending @Cognizant; Need Suggestions on Resignation Proof for an Interview

Hey everyone, I recently interviewed with ITC, and clear the first round. Now, they are asking for a screenshot of my last working day confirmation email. The issue is—I haven’t actually resigned yet.

During the HR call, they asked for my notice period, and I just mentioned 15 May (to keep things moving for the interview). Now, they want proof, and I’m unsure how to proceed.

Has anyone been in a similar situation? How did you handle it? Any suggestions would be really helpful!