Notifications not showing in app

I’ve searched to see if this has already been addressed somewhere but I haven’t found it. I have a Webcore piston running that alerts me when my sump pump goes off (by reading the power in a smartplug). The piston sends a push notification and stores in messages. This has been working fine for over a year now.

However, recently, even though my phone gets a notification, I no longer can see those notifications in the Smartthings app. My Notifications tab is empty, so if I don’t see the notification right away, I miss it.

I’ve updated my app and Smartapp, but I can’t get it to work.