Starting with Android 8.0, apps are required to assign their notifications to so-called “notification channels”. These channels determine which signals (notification sound, light, vibration, etc.) incoming notifications trigger.
If individual notification settings are activated for one or more chats in Threema, the app creates a separate notification channel for each chat. A channel’s ID is the name of the chat, which is visible in the device settings even when the Threema app is locked.
Xiaomi
If you use a Xiaomi device (including Pocophone) running MIUI 10 or later, please enable notification signals as outlined in this guide.
