In November after I wiped my System Cache Partition I stopped getting notifications from the Garadget app. I tried various suggested fixes such as changing a notification setting, logging out and logging back in, etc. Nothing worked. I did notice that an IFTTT based log file was in fact receiving events correctly so I set up an IFTTT based notification as a work around. That works (with some latency however).
I noticed that one recommended fix was to delete the app’s data, uninstall it, and reinstall the current version from the play store. I didn’t do that because I was going overseas for a month and didn’t want to risk making things worse. I am back now, and I tried that to no avail. I still get notifications through IFTTT but not directly through the app.
I was surprised, when I did the reinstall , that I did not have to log in. It seems to have had credentials cached somewhere(?).