I've been encountering this same problem, starting in 2020. I get a "wrong password" response after typing or pasting in my known good credentials. Happens in Safari, only fixed by clearing all my browser history, which clears all cache and resets cookies. I listen to Pandora more-or-less daily and this problem recurs every 2-3 weeks. I've seen the same symptoms when logging into my account on 3 different Macs, running 10.12, 10.13 High Sierra, and 10.15 Catalina.
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