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Synchronizing do not disturb across multiple Android devices
(self.askandroid)
It is possible to do this using a combination of Tasker and Join. I set up my devices so if one device changes DND state, it synchronizes to all my other devices.
In case you or others are interested, here is the Tasker project. After you import, there are a couple more things you'll need to do though.
I have it configured to use the 2nd Quick Settings to toggle enabling/disabling syncing. To set this up in Tasker, tap the three dots and go to Preferences. Tap the ACTION tab, and type "Sync DND" in the field (no quotes). After that, in Android, swipe down and add it as a QS tile.
To make it work, you'll have to manually configure each device's Join. Go to the side pane menu, tap on Actions. Create a new custom action. Enter this info: Command Name="DoNotDisturb", Command ="DoNotDisturb", Prompt="State". Unfortunately, every time you have a new device (or want to remove a device), you'll have to go through this process on the new device plus modify this action to include the new device in ALL devices (I couldn't figure out an easier way). Hopefully this won't be too frequent.