After trying many things and it still not working, I found this page (
https://www.drive2.com/l/567892534139814039/) which translated, says if you don't change the climate panel, it won't work as a parking heater and you'll get the "function not available" message. So just have to wait and freeze in the meantime
lol oh well. I did use ODIS-E to pair the remote and that worked.
While going down this rabbit hole I also found that there's a newer software that you can put on the Webasto, but couldn't find what it changes.
https://www.drive2.com/l/527977788150382629/ Have the file but I don't know if I'm brave enough to risk messing it up though.
@xabhax are you still having problems with EVAP? I forgot to mention that the nipple on top of the pump is open to the tank. Just used a razor blade to cut off the cap on top.