I have this same problem "ERROR Unable to add Pandora account"
Not solved at all. Pandora still wont load.
Moderator Edit: Changing title for clarity
Hi @UH60LCHIEF
Welcome to community!
Sorry for any trouble adding Pandora to your Sonos App. Unfortunately, we have little insight into the Sonos app, so there isn't any specific troubleshooting steps that we can offer.
If you haven't already, I would try:
If you continue to have trouble, I recommend reaching out to the Sonos support team for further assistance.