It's possible that the problem might be related to your iPhone's browser or settings. To begin, I recommend clearing your Safari browser's cache and website data. Here's how to do it:
- Open the Settings app on your iPhone.
- Scroll down and tap on Safari.
- Tap on Clear History and Website Data.
- Tap on Clear History and Data again to confirm.
After clearing the cache and website data, try accessing the Mountain Warehouse website again and see if you can apply the promo code successfully.
If clearing the cache and website data doesn't work, I suggest checking your iPhone's date and time settings to make sure they are correct. Incorrect date and time settings can sometimes cause issues with websites and their features, such as promo codes. To check your date and time settings:
- Open the Settings app on your iPhone.
- Tap on General.
- Tap on Date & Time.
- Make sure that Set Automatically is turned on. If it's off, toggle it on and wait a few moments for your iPhone to sync with the correct date and time.
If neither of these solutions works, it's possible that you are in private browsing mode, so it's worth noting that some websites might not function properly in private browsing mode. I suggest trying to apply the promo code while not in private browsing mode.