Maybe all new PWSweather accounts now require the key to be used instead of the account password. I'm still using the account password...but maybe I'm grandfathered. Try using that into the key field in WS View. Make sure you copy the whole key because it is really long (it is longer than what you see, unless you scroll, 32 characters!). Pull up the PWSweather account page with the key with your mobile device so that you can benefit from using the copy button instead of having to manually type in that long key. Then you can easily paste it into WS View. Another method to bring the key over from your computer to the phone is to use a password manager like LastPass (Save the credentials on the computer into LastPass and then pull them up on the phone with the LastPass app and copy/paste into WS View).
Copy button on PWSweather page next to the key:
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(Showing the above key is not a security concern because the entire key is not shown in the image.)
If it doesn't work then give it some time and try again in a few hours or tomorrow. It may take some time for your new PWSweather account to become ready to receive data.