You must have updated to the Beta App.
The Wyze Beta App is testing its own native notification sound that cannot be modified from within the app.
You will need to go to your Notification settings in your Android: Long Press the Wyze App Icon → App Info → Notifications → WyzeMessage (there may be two) → Advanced → Sound
You can change the sound to “Default” which will be the Android Supplied notification sound or you can choose one of your own from your notification sound folder. If you want to download a custom sound for the Wyze app from the internet, just be sure to save it in the Notifications folder on the root drive so that you can select if from the sound file browser that pops up.
The new WyzeMessage channel supplying the Beta App sound will be the one that lists the sound as “App Supplied”.