This error is displayed when no end date has been updated to the campaign (draft status). Please ensure to set up the correct end date in the campaign based on the redeemable's expiry to prevent the issue of redeemable expiring days before the campaign got ended.
Once the end date will be updated which is less than or equal to redeemable's expiry date, you will be able to save the campaign.
If further assistance is required, submit a ticket to Punchh Support. (For help submitting a ticket, click here)