Resend to the Non-openers did not work properly

The Resend to the Non-openers did not work.

I tested my campaigns on 16th Mar 2022 at 1 pm and scheduled the resend to those who did not open on 17th at 7 am, but the test account didn't receive the 2nd one even we did not open the email at all!

Is there any possible reason to explain this? and is there any solution to tackle this?

Thanks