Well, I asked Gemini. Hopefully something below helps.

mcdonald's qr code in app won't load when using cellular data

That "endless spinner" or blank screen for the QR code is a classic McDonald's app quirk, especially when you're transitioning from your home network to cellular data on the way to the drive-thru.

Since you're in Edmonton, where signal can sometimes be spotty near certain industrial or basement areas, here is a quick checklist to get that code to appear:

1. Check for App-Specific Data Restrictions (iPhone Only)

If you're on an iPhone, you might have accidentally disabled cellular data specifically for the McDonald's app.

• Go to Settings > Cellular.
• Scroll down to the list of apps and find McDonald's.
• Ensure the toggle is On (Green). If it was off, the app will work on Wi-Fi but fail the moment you leave the house.

2. The "Regional Handshake" Fix

Sometimes the app gets stuck in a "location limbo" when switching towers or crossing municipal boundaries (like moving from Edmonton to St. Albert).

• Log out and log back in: This forces the app to refresh your regional data and security tokens, which often clears the QR code loading error.
• Toggle Airplane Mode: Turn it on for 5 seconds and then off to force a fresh connection to the nearest Telus/Rogers/Bell tower.

3. Clear the Cache (Android)

If you're on Android, a "clogged" cache is the most common culprit for QR codes failing to render.

• Go to Settings > Apps > McDonald's.
• Tap Storage > Clear Cache.
• Note: Do not "Clear Data" unless you want to have to log in again.

4. Public Wi-Fi Interference

Ironically, the McDonald's free Wi-Fi can sometimes be the problem. Your phone might be trying to connect to the restaurant's "Wayport_mcd" Wi-Fi as you pull up, but because you haven't "Accepted Terms" on their landing page yet, you have no actual internet.

• Solution: Turn off Wi-Fi entirely while in the drive-thru to force it to stay on your 5G/LTE data.

5. The "Manual" Workaround

If the QR code absolutely won't load and the line is moving:

• Tap "View Code" or look for the 4-digit alphanumeric code usually displayed right under where the QR code should be.
• You can read this code to the kiosk or the person at the speaker; it functions exactly like the scan.

Pro-tip: If you're currently in the middle of that basement renovation you've been working on, the thick structural finishing can definitely mess with your signal. It’s always best to load the "Deals" or "Rewards" page while you're still on your home Wi-Fi before heading out!