Hi there! I see you're encountering the error message "SOMETHING WENT WRONG. We are unable to look up this transaction" when trying to upload a unique rewards code on the Panda Express app. I'd be happy to help you get this sorted out.

First, can you tell me a bit more about the situation? For example:
- Is this a code printed on a recent Panda Express receipt?
- Have you tried entering this code before, or is this the first attempt?
- Are you connected to a stable internet connection on your Mac while using the app or website?

This info will help me narrow down the cause.

Meanwhile, here's a simple checklist you can try to resolve this:

1. Confirm the Code Format and Validity:
- Make sure you are entering the code exactly as shown, no extra spaces, and it matches the expected format.
- Sometimes codes are limited to certain characters or length. For example, some users mentioned a 9-character limit for the app’s unique reward code entry.

2. Check for Duplicate Redemption:
- If you, or someone else, has already redeemed this transaction's code, it may no longer be valid. The app might show an error if the transaction was already claimed.

3. Clear App Cache or Browser Data:
- Since you are on macOS 10.15.7, if using the Panda Express website via a browser, try clearing your browser cache or try a different browser.
- If you are using the Panda Express mobile app via an emulator or another device, restarting the app might help.

4. Try Redeeming on a Different Device or Network:
- Sometimes network issues or device-specific bugs cause errors issuing rewards codes. Try using your phone or another device on a different Wi-Fi or cellular connection.

5. App/System Updates:
- Ensure your Apple device software is up to date, and the Panda Express app is the latest version if you are using a device that supports it.

If after these steps you still see the same error, the problem could be related to the Panda Express rewards system backend or an account issue. In such cases, contacting Panda Express support directly at [email protected] with your transaction details and receipt info can help get it resolved.

Let me know what you tried and what you observe, and we can take it from there! Are you satisfied with this guidance so far?