After replacing the iphone with a new one (and restoring from the old one), the loyalty cards stopped updating themselves. This means that notifications about changes on the cards stopped coming as well.
After investigating, we found out that it's an unchanged DeviceID on the card issuer's side (and PushID). If I turn the automatic card updates off and on again in my wallet, my new DeviceID registers and notifications start working again (with new PushID).
Question - is there any way for the pass issuer side to automatically detect that the pass holder has changed devices (has a new DeviceID or how to receive new PushID)?