How do I find out where the problem is? I can't move any further, even though I have the right configuration.
/dev/tty on remote server
root@kyle ~ # ls -la /dev/tty
crw-rw-rw- 1 root tty 5, 0 Aug 11 08:22 /dev/tty
INFO: Using passed SSH_KEY...
INFO: Adding known hosts...
INFO: Appending to ssh config file private key path
INFO: Applied file permissions to ssh directory.
Executing: program /usr/bin/ssh host 78.46.212.172, user cms, command scp -v -r -p -t /home/cms
OpenSSH_7.9p1 Debian-10+deb10u2, OpenSSL 1.1.1d 10 Sep 2019
debug1: Reading configuration data /root/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to 78.46.212.172 [78.46.212.172] port 22.
debug1: Connection established.
debug1: identity file /root/.ssh/pipelines_id type -1
debug1: identity file /root/.ssh/pipelines_id-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_7.9p1 Debian-10+deb10u2
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.4p1 Debian-10+deb9u3
debug1: match: OpenSSH_7.4p1 Debian-10+deb9u3 pat OpenSSH_7.0*,OpenSSH_7.1*,OpenSSH_7.2*,OpenSSH_7.3*,OpenSSH_7.4*,OpenSSH_7.5*,OpenSSH_7.6*,OpenSSH_7.7* compat 0x04000002
debug1: Authenticating to 78.46.212.172:22 as 'cms'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: kex: client->server cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:vwdKymSVIutzr7Z79SDWtp3XBut65h3S6OLbzXWt3a4
debug1: read_passphrase: can't open /dev/tty: No such device or address
Host key verification failed.
lost connection
✖ Deployment failed.