sftp + thunar in Debian 12 is in a password loop

I recently bought a new laptop and installed Debian 12 + xfce environment. And I'd like to access my server (which has Debian 12) with Thunar, as I always did before. I can access my server via sftp with the command line, but when I try to access it with the address bar in thunar (e.g. sftp://user@server.com/) it enters in a password loop, asking for the password continuously. Note that it should not even ask for the password, because I usually keep a ssh connection with the server and I use openssh multiplexing. I have all gvfs packages installed (needless to say that I can enter with my old laptop having ubuntu 20.04). Any clue? Thanks in advance for any suggestion. Alex