Hi
Here is the output for sftp -vvv tim@example.com
OpenSSH_8.6p1, LibreSSL 3.3.5
debug1: Reading configuration data /Users/tim/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 21: include /etc/ssh/ssh_config.d/* matched no files
debug1: /etc/ssh/ssh_config line 54: Applying options for *
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts' -> '/Users/tim/.ssh/known_hosts'
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts2' -> '/Users/tim/.ssh/known_hosts2'
debug1: Authenticator provider $SSH_SK_PROVIDER did not resolve; disabling
debug1: Connecting to example.com port 22.
debug1: Connection established.
debug1: identity file /Users/tim/.ssh/id_rsa type 0
debug1: identity file /Users/tim/.ssh/id_rsa-cert type -1
debug1: identity file /Users/tim/.ssh/id_dsa type -1
debug1: identity file /Users/tim/.ssh/id_dsa-cert type -1
debug1: identity file /Users/tim/.ssh/id_ecdsa type -1
debug1: identity file /Users/tim/.ssh/id_ecdsa-cert type -1
debug1: identity file /Users/tim/.ssh/id_ecdsa_sk type -1
debug1: identity file /Users/tim/.ssh/id_ecdsa_sk-cert type -1
debug1: identity file /Users/tim/.ssh/id_ed25519 type -1
debug1: identity file /Users/tim/.ssh/id_ed25519-cert type -1
debug1: identity file /Users/tim/.ssh/id_ed25519_sk type -1
debug1: identity file /Users/tim/.ssh/id_ed25519_sk-cert type -1
debug1: identity file /Users/tim/.ssh/id_xmss type -1
debug1: identity file /Users/tim/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_8.6
debug1: Remote protocol version 2.0, remote software version XFB.Gateway Unix
debug1: compat_banner: no match: XFB.Gateway Unix
debug3: fd 5 is O_NONBLOCK
debug1: Authenticating to example.com:22 as 'es10fg3'
debug3: record_hostkey: found key type RSA in file /Users/tim/.ssh/known_hosts:200
debug3: load_hostkeys_file: loaded 1 keys from example.com
debug1: load_hostkeys: fopen /Users/tim/.ssh/known_hosts2: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory
debug3: order_hostkeyalgs: prefer hostkeyalgs: rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug3: send packet: type 20
debug1: SSH2_MSG_KEXINIT sent
debug3: receive packet: type 20
debug1: SSH2_MSG_KEXINIT received
debug2: local client KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,ext-info-c
debug2: host key algorithms: rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,rsa-sha2-512,rsa-sha2-256,ssh-rsa,ssh-ed25519-cert-v01@openssh.com,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,ssh-ed25519,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ssh-ed25519@openssh.com,sk-ecdsa-sha2-nistp256@openssh.com
debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: MACs ctos: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,zlib@openssh.com,zlib
debug2: compression stoc: none,zlib@openssh.com,zlib
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug2: peer server KEXINIT proposal
debug2: KEX algorithms: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,curve25519-sha256,curve25519-sha256@libssh.org
debug2: host key algorithms: ssh-rsa
debug2: ciphers ctos: aes256-cbc,aes256-ctr,aes128-cbc,aes128-ctr
debug2: ciphers stoc: aes256-cbc,aes256-ctr,aes128-cbc,aes128-ctr
debug2: MACs ctos: hmac-sha2-256,hmac-sha1,hmac-sha1-96
debug2: MACs stoc: hmac-sha2-256,hmac-sha1,hmac-sha1-96
debug2: compression ctos: none
debug2: compression stoc: none
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ssh-rsa
debug1: kex: server->client cipher: aes128-ctr MAC: hmac-sha2-256 compression: none
debug1: kex: client->server cipher: aes128-ctr MAC: hmac-sha2-256 compression: none
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug3: receive packet: type 31
debug1: SSH2_MSG_KEX_ECDH_REPLY received
debug1: Server host key: ssh-rsa SHA256:hGn3OiqHcSEVML4xIvmRDpGzhTEiHBpoQBhbs1U9rzo
debug3: record_hostkey: found key type RSA in file /Users/tim/.ssh/known_hosts:200
debug3: load_hostkeys_file: loaded 1 keys from example.com
debug1: load_hostkeys: fopen /Users/tim/.ssh/known_hosts2: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory
debug1: Host 'example.com' is known and matches the RSA host key.
debug1: Found key in /Users/tim/.ssh/known_hosts:200
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey out after 4294967296 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: receive packet: type 21
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey in after 4294967296 blocks
debug1: Will attempt key: /Users/tim/.ssh/id_rsa RSA SHA256:mh5yZgT8qsP83ie6Ka1WMrnSnbLrzrmWcVJKubB+0Os agent
debug1: Will attempt key: /Users/tim/keys/example-prod.pem RSA SHA256:U7BxS2twTY0O+A7ra8vGM4NnlTa+r6rUIWuOZp5m6Xw agent
debug1: Will attempt key: /Users/tim/keys/example-production-bastion.pem RSA SHA256:0XefFR348UfoFWBqmfBAMAFs539y2HwoUQeGQRkscOE agent
debug1: Will attempt key: /Users/tim/.ssh/id_dsa
debug1: Will attempt key: /Users/tim/.ssh/id_ecdsa
debug1: Will attempt key: /Users/tim/.ssh/id_ecdsa_sk
debug1: Will attempt key: /Users/tim/.ssh/id_ed25519
debug1: Will attempt key: /Users/tim/.ssh/id_ed25519_sk
debug1: Will attempt key: /Users/tim/.ssh/id_xmss
debug2: pubkey_prepare: done
debug3: send packet: type 5
debug3: receive packet: type 6
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug3: send packet: type 50
debug3: receive packet: type 51
debug1: Authentications that can continue: password,publickey
debug3: start over, passed a different list password,publickey
debug3: preferred publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Offering public key: /Users/tim/.ssh/id_rsa RSA SHA256:mh5yZgT8qsP83ie6Ka1WMrnSnbLrzrmWcVJKubB+0Os agent
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 60
debug1: Server accepts key: /Users/tim/.ssh/id_rsa RSA SHA256:mh5yZgT8qsP83ie6Ka1WMrnSnbLrzrmWcVJKubB+0Os agent
debug3: sign_and_send_pubkey: RSA SHA256:mh5yZgT8qsP83ie6Ka1WMrnSnbLrzrmWcVJKubB+0Os
debug3: sign_and_send_pubkey: signing using ssh-rsa SHA256:mh5yZgT8qsP83ie6Ka1WMrnSnbLrzrmWcVJKubB+0Os
debug3: send packet: type 50
debug3: receive packet: type 1
Received disconnect from 168.183.167.31 port 22:1: ssh disconnect host not allowed to connect
Disconnected from 168.183.167.31 port 22
Connection closed