Invalid csrf message on Discovercard app when trying to add new bank account

Hello there, kid million.

It sounds like the Discover app that you have downloaded to your iPhone 6 is generating an error when you attempt to add a new payment option. The following Knowledge Base article offers up some practical and in-depth steps for troubleshooting:

If an app you installed unexpectedly quits, stops responding, or won’t open - Apple Support

Restart the app

Close the app and open it again.

Restart your device

Turn your device off and back on.

Check for iOS and app updates

1. Make sure that you're using latest version of iOS.
2. Open the App Store and tap Updates.
3. If updates are available, tap Update All.
4. If asked, enter your Apple ID password.

You might need a Wi-Fi connection to update some apps.

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Delete and reinstall the app

1. Tap and hold the app until it jiggles.
2. Tap the on the app.
   
3. Press the Home button.
4. Go to the App Store and download the app again.
5. Wait for the app to download, then open it from the Home screen.

Contact the app developer

If you see this issue again, contact the app developer for help:

1. Find the app in the App Store.
2. Tap the app, then tap Reviews.
3. Underneath App Store Customer Reviews, tap App Support.
   

Thanks for being a part of Apple Support Communities.

Cheers.

Hello again, kidmillion.

Thanks for the follow-up response. I'm glad you were able to find a solution for your issue.

Kind Regards.