Hi there! Sorry to hear you're having trouble signing into the M&S app on your Mac with OS X 10.15.7. Let’s start by getting a little more detail so I can help you better:

- Are you encountering any specific error messages when you try to sign in?
- Is this happening only on the M&S app or also when you try to sign in on their website?
- Have you recently reset your password or changed any account details?
- Have you tried any troubleshooting steps so far, like restarting the app or your Mac?

Once I have a bit more information, I can guide you through some steps to get you signed in.

M&S app not responding

Thanks for letting me know the M&S app is not responding on your Mac. Let's work through some steps to get it back up and running smoothly.

Since you're on macOS 10.15.7, here’s what you can do:

1. Force Quit the App
- Click the Apple menu (top left corner), select "Force Quit…"
- Find the M&S app in the list, select it, and click "Force Quit."
- Then try reopening the app.

2. Check Your Internet Connection
Sometimes slow or spotty internet causes apps to freeze or not respond. Ensure your Wi-Fi is stable by opening a website in your browser.

3. Update the App
While macOS apps often update via the App Store, sometimes updates fix issues. Check the App Store for any pending updates for the M&S app and install them.

4. Restart Your Mac
A fresh restart can clear temporary glitches that make apps unresponsive.

5. Clear App Cache (if possible)
macOS apps usually store cache files that can cause issues if corrupted. On the Mac, clearing app cache involves going into Finder:
- Open Finder > Go > Go to Folder…
- Type ~/Library/Caches and press Enter.
- Find any folders related to M&S or the app developer and delete them carefully.
- Then restart the app.

6. Reinstall the App
If none of the above work, deleting the app and reinstalling it can help:
- Drag the M&S app to the Trash and empty it.
- Download the latest version from the Mac App Store and install again.

If after all this, the app still won’t respond, it might be a backend issue or a known bug. Checking M&S service status or forums can confirm if other users are impacted:
- M&S Bank app status page or customer forums
- Social media groups discussing M&S app issues1 8 9

Would you like me to help you go through any of these steps in detail? Or if you’ve already tried some, tell me which so I can suggest next moves.