No, that didn't help, but I did find the solution. So for those experiencing this problem, here's what I had to do: Like the rest of you, when trying to setup the app using my existing account, I got the error above when logging in with my credentials. Resetting my network connection, as the moderator suggested, didn't fix anything. So I went back to the setup, and this time, instead of choosing "I have an existing account", I chose the option to setup a new account. It brings up a screen that tells you to go to pandora.com/pioneer and enter the activation code that's on screen. Once I did that, the online activation page asks you if you want to setup a new account or lookup an existing account. THEN you can choose to login with your existing account and the receiver app finally logs in and activates after you do. It appears to be a flaw in the Pioneer app.
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I just setup my new Pioneer Elite SX-30 network receiver, and when I try signing into the built-in Pandora app, it simply gives me an "Account Error" message. I've verified my login password and know that's not the issue, and can login via my iPhone, Xbox and the website. I see people were logging similar issues with their other receivers and such earlier this year - is there a resolution coming to this issue?
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