I'm new to Kodi, but unfortunately not able to view video on it. The add-ons show error (Ard / Zdf Mediathek) and Youtube (with all the client ID stuff in google cloud).
After the wetek core mini did not work, i tried windows laptop, but result is the same. To avoid connection problems with router, I switched to mobile phone connection, but both clients do not work. Internet connection seems to work, I could install the video add-ons and the log view add-on.
Is this error of kodi or me? 
I'd understand if the WeTek Core didn't work; the last image we published was LE 8.2.5 and this is dated so some add-ons might have issues and not work now. However, if you also see the same on a completely different OS platform it would suggest something in your network or upstream from you (but what, is anyone's guess). In either case .. share debug logs. Maybe we see something you don't.
HTTPError: HTTP Error 410: Gone^ Same message in both logs. I'd guess something changed upstream and the add-on needs fixing .. best to read/ask in the Kodi forum thread for the add-on.
ARD/ZDF Mediathek are outdated in Kodi repo and continued at GitHub - 68000a/Gigathek: Kodi Addons zu verschiedenen deutschen öffentlich-rechtlichen TV-Mediatheken
