This just happened to me from the Sonos desktop app. However, I managed to get it to work from my smartphone (Android). This doesn't always solve the problem though...I've had this happen off and on for years. It's not just isolated to Pandora. I've had this same "access denied" message with Amazon Music as well. It's a Sonos problem which I wish they would figure out. Since I've been using Sonos since 2005, when this happens, I typically switch to my other streaming service...or listen to my music library.
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