You cannot officially view an Instagram message after the sender unsends it
Check notifications if the message preview was shown before it was deleted
Review email notifications if Instagram message alerts were sent to your email
Check connected devices that may have cached the message in a notification center
Use Instagram data download to see messages that were still present before unsending
Ask the sender to resend the message
Avoid third-party apps or websites that claim to recover unsent messages
Keep notification previews enabled to catch future messages before they are unsent