I was able to successfully connect to WU. Not sure if this helps anyone else, but just wanted to share, I connected my weather station to Wi-Fi using the La Crosse View App. After my station was connected to the internet, I then used the Weather Connect App to connect my station with my WU account. Do not use the Weather Connect app to set WiFi Device. I did not enter in my WiFi password into the weather connect app, just the PWS and Key. I first made the mistake and used my PWS ID and my WU login password. This was incorrect, I needed to used my "Key" that was assigned by WU as my Password. Without that key, WU will not allow data to be uploaded. It did take about 40 minutes after using the Key instead of my password before my station status updated to online. Hope this helps.

Despite using the proper frequency on a mobile device, the app fails to recognize the 2.4GHz network, thus you cannot connect and move forward in link your PWS with Weather Underground. Further, the app is broken- when using other functions of the app, such as registering for a PWS ID from Weather Underground, you get the message: “An unknown error occurred, try again.” The apparent problems that plagued the app (as many have mentioned prior) have obviously continued to; the Weather Connect has not been updated in several years. Disappointing because I’d love to utilize the data and share it.

If it were not for KCS84's post below, this was going in the trash. I bought this to replace an Accurite station, install is super simple. Documentation does not exist, there are no instructions for recommended mounting positions. I had the same issue with my setup (Airport Extreme) 2.4Ghz and 5 Ghz both on, the station would connect to my wireless, but the app never indicated so, it would always show fail. Per the info in KCS84's post, I disabled the 5GHz on the router, and the app worked instantly. I re-enabled the 5GHz and still works just fine.

Same issue everyone else is having. Except in my case, I have a modem/router that is managed by my ISP, so I have no ability to login and control it. Therefore, I cannot disable the 5 GHz channel, which means that this app will not work at all for me. Very disappointed, as sharing my weather station on Wunderground was the main reason I spent the $80 to buy the weather station.What’s extra disappointing is that the regular La Crosse View app works just fine, so clearly they have the ability to support the product. They just choose not to update this app or integrate its functionality in the La Crosse View app.