fortivpn on debian: Failed to set creadential

I am trying to establish a VPN connection from an Amazon Web Services instance (debian) to my company using forticlient_vpn_7.0.0.0018_amd64.deb.

With forticlient on Windows I can connect to my company.

Now on Debian:

1. with "fortivpn edit KMC" I could create a configuration.

2. fortivpn connect KMC --user="Edmund Mergl" ends with the following error:

Failed to set creadential. No such interface "org.freedesktop.Secret.Collection" on object at path /org/freedesktop/secrets/collection/login

This seems to be a fairly common error message. I tried installing gnome-keyring, but that didn't help.

The path /org/freedesktop does not exist.

Any help is appreciated.