I've been struggling with this problem since last August. I've read numerous posts on this thread with various solutions of which none worked for me. However, when I used the link you provided to downgrade Pandora to 2203.1 my Pandora FINALLY worked again!! I've disabled Pandora auto updates and will keep on using this version. I am hoping that Pandora doesn't make changes to their website to make this app version incompatible, because that would be very upsetting! They really need to fix this issue if they do that. In the meantime, I am very happy that I can now control Pandora again from my 2018 Mazda 6! Your solution should somehow be pinned on this thread.
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