after a long time seeing this issue, I wonder if there is a solution to it.

When I want to use the Deezer-App via the Webinterface from MySqueezebox.com I always get the error-message:
"Your player is not authorized to use mysqueezebox.com."

But there is one exception: Firefox-Browser on one of my PCs does actually work. None of the other Browsers (Chrome, Edge) on this PC does work, nor does any of my other devices in the same Network (Win10 machine, IPad, Fire Tablet ...).

Does anyone have an idea how to solve or debug this issue?
Any help is appreciated