Contact sensor shows 'open' but not 'closed'

Just put a contact sensor on the back door. It notifies me when the door ‘opens’ but fails to notify when ‘closed’.
Sensor is only about 8 feet from the bridge, no obstructions, wifi signal is great.
What’s the problem here?

I think this might be the default behavior. Did you set the app to notify you when it closes? To do so, you would open the sensor in the app, click the gear icon at the top right, then click Notifications. You can toggle any of the four notification types – Opens, Closes, Is left open, and Is left closed. There will be a check mark to the right of the action if it’s enabled.

As for the main sensor screen, by design it only reports Opened, and uses the close time to report the length of time it was open for.

Better explanation here:

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And now the sensor came off. It’s only up there because the magnet inside clung to the door.

I’m getting tired of these attempts By wyze to make cheap alternatives to the more expensive guys but it doesn’t seem to be working out.
Me, when I got the first regular wyze cam: YAAAY!
Me, with every product since then (pan, sensors, bulb): WHY ISN’T THIS WORKING!?

I hear you on the adhesive. Check this thread for some ideas/alternatives. For mine I cut down the adhesive strip from an unused 3M Command hook, and fingers crossed, so far so good.

As for the notifications, how much time is passing between when the sensor is opened (and you get the notification) to when it is closed next? Have you tried clearing the Opened notification from your phone before trying to close the sensor? As a last resort, just to see if it works, have you tried enabling only the Closes notification setting, and then open and close the sensor?

To rule out proximity/reception, If you haven’t mounted the other sensor from the kit, you could try configuring it similarly with both Opens and Closes notifications, and then open and close the sensor just a few feet from the Sense hub.

If still no luck you’ll probably need to fill out a tech support request.