That’s right. No loudness. To be sure I deleted my library and re-added all my music. Reauthorised Plex in the Sonos app. Reauthorised the Alexa. No difference at all. I can ask for Plex music on a normal Echo device and it works fine. Sonos fails.
Mod-Edit: removed screenshot with user token
Please never post this information. It’s like giving away your user credentials on a public marketplace

