3DS - No notification or option to approve in Curve App

Issue: (one-sentence summary)
3DS purchases (usually over £50) give no popup or option to verify in app.

How to reproduce it:
Any 3DS purchase

OS:
Android (latest)

Device:
Samsung s9 plus

App version:
Latest

Screenshot:
N/A

A post was merged into an existing topic: Curve card transactions requiring 3D email/sms/app verification are failing