Can not use hang seng bank e-banking apps

Hi mc268,

Thanks for coming to Apple Support Communities for help today.

For help with your banking app, we'll need to refer you to the app developer for a resolution. Here's how: How to contact an app developer

"Contact the developer of an iOS, iPadOS, or watchOS app

1. Open the App Store on your iPhone, iPad, or iPod touch.
2. Search for the app, then tap it. If you can't find it, tap the account button  or your photo at the top of the screen, tap Purchased, tap "Not on this [device]," then tap the app.
3. The app's product page appears. Scroll to the Ratings & Reviews section, then tap App Support. If you don't see App Support, make sure that you're signed in with the correct Apple ID."

Have a fantastic day!