Your local emonCMS and emoncms.org are different, so each has their own APIkey.
And are you using the correct one? To send data, you must use the “Read and Write” APIkey, get it from “Input API Help” on the top right corner of the Inputs page.
You can test it in your web browser by copying into the address line the example whose description starts “To post data from a remote device …”, when you should see “ok” and back on the Inputs page, the three power values should appear.
