The required permission is missing" error in Call Guard after updating to Avast One (Android 15/16)

Hi everyone,

I noticed that the app name has automatically changed to Avast One.

When I try to set up Call Guard by following the steps provided in the app, I get to the “Select default Caller ID & Spam app” screen. However, after selecting Avast One, it displays a message saying “The required permission is missing” (必要な権限がありません) right under the app name.
I have already enabled all possible permissions in the system settings, and there are no other items left to toggle on.

This issue occurs on both of my devices:

Xperia 1 V (XQ-DQ44 / Android 15)
Xperia 10 VI (XQ-ES44 / Android 16)

The exact same thing happens on both. Does anyone know a fix for this?
Any help would be appreciated. Thanks!