I'm currently adding some tracking in my app with the Measurement Protocol. When I use it in dev/staging, it works like a charm, however when I am targeting production, it doesn't work anymore.
I've already try a bunch of tests and I know for sure that the problem isn't in my code: When I test with my old id (UA-xxx-1) it doesn't work, but when I create a new app (UA-xxx-2) it does work.
That's why I suspect I may have misconfigured something on the Google Analytics side.
Does anyone has an idea about what it could be?
I don't want to use a new web property since I already have a large amount historic data in the old one.
I've finally found the origin of the missing data: I had an old filter removing all the requests without Browser Size filled in.
Thx for the help.