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Created attachment 24922 [details]
logcat of bug
Specifically the NotificationCompat.Builder constructor with the overload that accepts channel, as well as the SetChannel method throw MissingMethodException
Do you have a reproducible solution for this? I can't seem to make it fail here.
One thing to try is deleting your bin/ and obj/ folders, and `adb uninstall com.your.package` from the device before rebuilding and trying again (especially if you just updated your nuget packages between debug builds).