The recent issue preventing returns from processing was caused by updates to Shopify's app scope permissions. A resolution is now available, but it requires manual authorization from a store administrator to restore full functionality.
How to Apply the Fix
Log in to your Shopify store using a Shopify Admin account.
Navigate to the Returns app.
Look for the banner at the top of the screen that exactly states: "The permissions required by Narvar Return & Exchange have been updated. Please click the following link for more details. Update the permissions"
Click the link within the banner to authorize and update the scope permissions.
Once these permissions are updated, the returns portal will function normally. Please reach out to our support team if you continue to experience any issues after completing these steps.