The information from the support page may need updating?
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Example URL:
02+10%3A32%3A55&winddir=230&windspeedmph=12&windgustmph=12&windgustdir=25&humidity=90&dewptf=68.2&tempf=70&rainin=0&dailyrainin=5&baromin=29.1&soiltempf=25&soilmoisture=25&visibility=25&softwaretype=weathersoftware1.0
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I think the six figure siteid is now the one shown when you log in & click on MySites select your site and it is under the map in brackets under your site name.
This is not a six figure number, but a group of five alphanumeric codes.
The siteAuthenticationKey I used is the one I was given when I registered with datapoint, so the other two numbers shown when you expand Site Details
(Observation Id & User ID) may be confusing the issue?
Jay