I’ve also experienced this in the last few days, though I suspect the issue may be with Samsung. I’ve provided more details here: https://en.deezercommunity.com/other-devices-49/samsung-multi-room-login-issue-24265/index2.html#post160398 One additional thing I noticed this evening is that my Soundbar’s clock seems to be wrong, if its internal server’s responses to CURL requests are anything to go by. I do know that clocks being incorrect can cause SSL/TLS errors, at least with desktop browsers, so potentially this could be causing an inability for the Soundbar's ability to connect to Deezer’s authentication endpoint.
So, I’ve just recently encountered the ID login error, now coming up without fail, making it impossible to use on my Samsung K950 soundbar. This is a bummer of note, as I used to use it to play FLAC’s from Deezer. I can still use bluetooth, but the quality is absolutely abysmal. I’ve gone through all the loops of uninstalling, re-installing, rebooting & resetting all devices involved, as well as the password itself to no avail. I did some more digging, and it turns out the Multiroom app doesn’t connect to Deezer (or any of the other integrations) itself. Instead, it simply sends instructions to the soundbar, which is meant to connect to Deezer. Thus, all the connection logic sits on the soundbar (which actually runs an Express HTTP server), and not in the app. I used some packet capturing to inspect the flow of request/responses between the app and soundbar while trying to login to Deezer, and noticed that the error message that we get (incorrect ID/password) is probably not correc
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