There still seems to be a glitch with this.
Tickets can be priced now from Swiss cities to Basel Euroairport, but not from German cities to the airport. I messaged SBB online but they said it was because the scheduled was not loaded properly to the airport. (I have tried on SBB and DB sites)
I can get round this by buying two separate tickets, but it’s a bit more expensive.
This is not very important, but it is annoying me!