WW-31.1010.0411.122 from 07-SEP Contains the updated Android security patch to 2022-08-05. That's the latest security patch available for the Zenphone 8. Version WW-31.1010.0411.113 from 04-AUG also contains the updated Android security patch to 2022-08-05.
My phone never got the update from 04-AUG, and was on the WW-31.1010.0410.72 version, which has the 2022-04-05 Android security patch.
It's unclear whether it's the firmware update or the security patch that is causing the issue since, at least in my case, both were applied at the same time. However, there doesn't seem to be a problem for other devices with the security patch to 2022-08-05 (based on browsing the web, I don't personally have another device with that security patch), and this thread was created after the 07-SEP firmware was released.
Can anyone with the WW-31.1010.0410.72 (04-AUG) version or another device that got the security patch to 2022-08-05 confirm whether AT&T MVNOs are working?