Not a big deal, but A1064 is not a valid model number for the AirPort Express, so you likely have a model A1264.
Let's see......things were working fine before you updated to iOS 16.2.....so the issue likely has more to do with the iOS update than it has to do with the AirPort Express, since nothing changed on the AirPort Express.
We assume that you have already powered off and restarted the AirPort Express, correct?
We also assume that you have powered off the iPhone and restarted, correct?
If you have not done this, now might be a good time to see if a simple restart of things will help.
If you have already restarted the AirPort Express and iPhone and that has not helped, you might want to try updating the iPhone to iOS 16.3......since the latest update claims to incorporate bug fixes from the previous iOS version. Remember to power and restart devices after the update.
Please post back on your results.