You have reached the staging deep-link domain.
This is the staging environment. Its app is a
separate application id, bar.ageshield.app.staging, and it is
not published on the App Store or Google Play — the
store listings carry the production app, which talks to a different
backend and different data.
Install the staging build from CI or a local build
(scripts/mobile-dev.sh), not from a store.
Scanning a device-login or activation link on this domain still works — it is only the install that differs.