CayenneLPP.h doesn’t seem to be an official Cayenne library, so I don’t think you’ll get a whole lot of help here on that. Here is the documentation is on the Cayenne LPP payload. Add in a line at the bottom of your sketch Serial.println(lpp.getBuffer()); to see what you are actually sending to the Cayenne servers. If I had to guess it doesn’t match LPP 2.0. @eptak can assist further and let you know what they are seeing on the server.
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