Title say it all, it is very weird. This is my code:
FirebaseAnalytics analytics = FirebaseAnalytics.getInstance(ctx);
analytics.setUserProperty(MY_PROP, "test");
That is pretty much all. I can clearly see this in Android studio logging and sending, also receiving them in Firebase console in section DebugView - but even after 4 days, they are still not shown in User Properties.
Why?
First you have to register the User property in the "User properties" tab in Firebase console - Analytics. It wont appear just after you call the setUserProperty() method, as mentioned here: https://firebase.google.com/docs/analytics/user-properties?platform=android
Sometimes, even the DebugView don't show the property if you haven't create the property in firebase console.
This has updated slightly and they're now called Custom dimensions in the user interface
It also mentions it can take up to 48h for a custom dimension to take effect.