This only works for Web properties and apparently doesn't work with Mobile App properties. I have one set up and it returns a 200 response code whenever i send up the event -- but it never shows up on the Real Time - Events page. Probably won't worry about this unless someone asks for it.
Mobile Properties are deprecated now and are replaced with just a View (which will also be deprecated soon). So for now, just use regular web property and think about shifting to Firebase Analytics
This only works for Web properties and apparently doesn't work with Mobile App properties. I have one set up and it returns a 200 response code whenever i send up the event -- but it never shows up on the Real Time - Events page. Probably won't worry about this unless someone asks for it.