I am also experiencing this issue. Pandora only lets me log in on Chrome-based browsers, but will not let me log using Firefox. I have cleared all site data and cookies and it still tells me that my password is incorrect.
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I am using Vivaldi on macOS 11.2.3 and Shuffle All Stations stopped working this afternoon. It's only playing one station at a time and is giving me the same error message as @duckslapper86.
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