Hi @care.nuts,
Thank you for your thorough troubleshooting and communication thus far.
While authentications and local streaming pass through RoonServer, Tidal/KKOX/Qobuz streaming is fetched directly from the API via the mobile connection. In your case, providers one and two above seem to use a flaky CDN for Tidal.
DNS reassignment is the most common solution to this problem, particularly if local streaming via ARC is functioning just fine. You’ve already tried this without a change in symptoms.
Do you have the Tidal native app? Do you encounter any issues there?
Compare the APN settings between the effected eSIM and the unaffected eSIM, as an additional suggestion.
We’ll follow up from there!