VS Code SSH-Remote to Rapberry Pi says: The VS Code Server failed to start

I'm trying to connect to my Rapberry Pi running Raspbian (september 2019 version) using the Remote Development extension in VS code (see here). My OpenSSH is working correctly as well as my key based authentication (cmd lets me connect with pi@192.168.2.6 without providing the password).

My ssh config file looks as follows:

Host 192.168.2.6
HostName 192.168.2.6
User pi
IdentityFile C:/Users/ttimo/.ssh/id_rsa

When connecting to the host in VS Code I get the following error:

   [15:34:22.437] "install" terminal command done
   [15:34:22.439] Install terminal quit with output: 683ac00a76dd##32##
   [15:34:22.439] Received install output: 683ac00a76dd##32##
   [15:34:22.440] Resolver error: The VS Code Server failed to start
   [15:34:22.447] ------

I tried deleting the .vscode folder on my RPi but this did not work.

Thanks in advance