Problems getting access to my VM with X2Go

Hello everybody, I am experiencing some issues with getting access to my VM through X2Go. I have followed the steps on https://docs.terrascope.be/#/Developers/VirtualEnvironments/VirtualMachines?id=setting-up-x2go-to-use-the-key-pair but when I am logging in to start a session, I receive the error "The remote proxy closed the connection while negotiating the session. This may be due to the wrong authentication credentials passed to the server." I am however sure that I am using the right username and password because I have no issue getting access through putty. I also tried to manually delete my X2Go session through putty with x2goterminate-session, but I still receive the error.