Hello @ElisaV5 ,
Can you provide any elaboration on what's occurring when you attempt to resend? Are you getting any specific error messages? Were the emails you're attempting to resend setup for automatic Resend to Non Openers at time of scheduling or after, or were you attempting to do a different type of resend? If it was an email that'd already sent, and wasn't originally setup for an automatic RSNO, was your resend attempt within 3 days of the original sendout?