Is there SessionOptions equivalent to 'Respond with password to the first prompt'?

I have a script that connects to an SFTP server. It works well with most servers, but with one server I get the following. My thought is that I need to do the equivalent to the 'Respond with password to the first prompt' that's available from the Site Manager setup windows. The other server offer 'publickey, password, keyboard-interactive' as authentication methods, but this one only offers 'publickey, password'. Is there something else we need to be doing here?

It looks like the script does not even include the credentials. Please double check. Otherwise, please post complete log.

Thanks for looking. I excerpted the log a little in my original post, will attach the complete one this time.
I did subsequently find the Session.AddRawConfiguration method, and tried several variations like this (tried with $true, $false, 0, 1, "0", "1" as parameters):
#$session.AddRawConfiguration("AuthKIPassword", $true)
#$session.AddRawConfiguration("[Sessions\blahblah\AuthKIPassword]", $true)
But no luck getting the login to work. Using WinSCP from Powershell a script.
Here's a complete sanitized log of a failed session:
. 2025-04-01 14:01:47.217 --------------------------------------------------------------------------
. 2025-04-01 14:01:47.217 WinSCP Version 6.3.3 (Build 14916 2024-04-16) (OS 6.3.9600 – Windows Server 2012 R2 Standard)
. 2025-04-01 14:01:47.217 Configuration: nul
. 2025-04-01 14:01:47.217 Log level: Normal
. 2025-04-01 14:01:47.217 Local account: blah/lakkal
. 2025-04-01 14:01:47.217 Working directory: C:\blah\Scripts
. 2025-04-01 14:01:47.217 Process ID: 8652
. 2025-04-01 14:01:47.217 Ancestor processes: ...
. 2025-04-01 14:01:47.217 Command-line: "C:\blah\Scripts\winscp.exe" /xmllog="C:\Users\lakkal\AppData\Local\Temp\3\wscp225C.01BDACE5.tmp" /xmlgroups /xmllogrequired /nointeractiveinput /stdout /stdin /dotnet=6.3.3 /ini=nul /log=".\MapSFTP.log" /console /consoleinstance=_8796_56668334_549
. 2025-04-01 14:01:47.217 Time zone: Current: GMT-4, Standard: GMT-5 (Eastern Standard Time), DST: GMT-4 (Eastern Daylight Time), DST Start: 3/9/2025, DST End: 11/2/2025
. 2025-04-01 14:01:47.217 Login time: Tuesday, April 1, 2025 2:01:47 PM
. 2025-04-01 14:01:47.217 --------------------------------------------------------------------------
. 2025-04-01 14:01:47.217 Script: Retrospectively logging previous script records:
> 2025-04-01 14:01:47.217 Script: option batch on
< 2025-04-01 14:01:47.217 Script: batch on
< 2025-04-01 14:01:47.217 Script: reconnecttime 120
> 2025-04-01 14:01:47.217 Script: option confirm off
< 2025-04-01 14:01:47.217 Script: confirm off
> 2025-04-01 14:01:47.217 Script: option reconnecttime 120
< 2025-04-01 14:01:47.217 Script: reconnecttime 120
> 2025-04-01 14:01:47.217 Script: open sftp://username@sftp.something.com:22 -hostkey="ecdsa-sha2-nistp256 256 blahblah" -privatekey="C:\SFTPKey\prod.ppk" -timeout=300 -passphrase=***
. 2025-04-01 14:01:47.217 --------------------------------------------------------------------------
. 2025-04-01 14:01:47.217 Session name: username@sftp.something.com (Ad-Hoc site)
. 2025-04-01 14:01:47.217 Host name: sftp.something.com (Port: 22)
. 2025-04-01 14:01:47.217 User name: username (Password: No, Key file: Yes, Passphrase: Yes)
. 2025-04-01 14:01:47.217 Tunnel: No
. 2025-04-01 14:01:47.217 Transfer Protocol: SFTP
. 2025-04-01 14:01:47.217 Ping type: Off, Ping interval: 30 sec; Timeout: 300 sec
. 2025-04-01 14:01:47.217 Disable Nagle: No
. 2025-04-01 14:01:47.217 Proxy: None
. 2025-04-01 14:01:47.217 Send buffer: 262144
. 2025-04-01 14:01:47.217 Compression: No
. 2025-04-01 14:01:47.217 Bypass authentication: No
. 2025-04-01 14:01:47.217 Try agent: Yes; Agent forwarding: No; KI: Yes; GSSAPI: Yes
. 2025-04-01 14:01:47.217 GSSAPI: KEX: No; Forwarding: No; Libs: gssapi32,sspi,custom; Custom:
. 2025-04-01 14:01:47.217 Ciphers: aes,chacha20,aesgcm,3des,WARN,des,blowfish,arcfour; Ssh2DES: No
. 2025-04-01 14:01:47.217 KEX: ntru-curve25519,ecdh,dh-gex-sha1,dh-group18-sha512,dh-group17-sha512,dh-group16-sha512,dh-group15-sha512,dh-group14-sha1,rsa,WARN,dh-group1-sha1
. 2025-04-01 14:01:47.217 SSH Bugs: Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto,Auto
. 2025-04-01 14:01:47.217 Simple channel: Yes
. 2025-04-01 14:01:47.217 Return code variable: Autodetect; Lookup user groups: Auto
. 2025-04-01 14:01:47.217 Shell: default
. 2025-04-01 14:01:47.217 EOL: LF, UTF: Auto
. 2025-04-01 14:01:47.217 Clear aliases: Yes, Unset nat.vars: Yes, Resolve symlinks: Yes; Follow directory symlinks: No
. 2025-04-01 14:01:47.217 LS: ls -la, Ign LS warn: Yes, Scp1 Comp: No; Exit code 1 is error: No
. 2025-04-01 14:01:47.217 SFTP Bugs: Auto,Auto
. 2025-04-01 14:01:47.217 SFTP Server: default
. 2025-04-01 14:01:47.217 Local directory: default, Remote directory: home, Update: Yes, Cache: Yes
. 2025-04-01 14:01:47.217 Cache directory changes: Yes, Permanent: Yes
. 2025-04-01 14:01:47.217 Recycle bin: Delete to: No, Overwritten to: No, Bin path:
. 2025-04-01 14:01:47.217 DST mode: Unix
. 2025-04-01 14:01:47.217 --------------------------------------------------------------------------
< 2025-04-01 14:01:47.217 Script: Searching for host...
. 2025-04-01 14:01:47.232 Looking up host "sftp.something.com" for SSH connection
. 2025-04-01 14:01:47.232 Connecting to 0.0.0.0 port 22
. 2025-04-01 14:01:47.264 Connected to 0.0.0.0
< 2025-04-01 14:01:47.264 Script: Connecting to host...
. 2025-04-01 14:01:47.264 We claim version: SSH-2.0-WinSCP_release_6.3.3
. 2025-04-01 14:01:47.264 Connected to 0.0.0.0
. 2025-04-01 14:01:47.311 Remote version: SSH-2.0-MOVEit Transfer SFTP
. 2025-04-01 14:01:47.311 Using SSH protocol version 2
. 2025-04-01 14:01:47.311 Have a known host key of type ecdsa-sha2-nistp256
. 2025-04-01 14:01:47.342 Enabling strict key exchange semantics
. 2025-04-01 14:01:47.342 Doing ECDH key exchange with curve Curve25519, using hash SHA-256
. 2025-04-01 14:01:47.420 Host key fingerprint is:
. 2025-04-01 14:01:47.420 ecdsa-sha2-nistp256 256 blahblah
< 2025-04-01 14:01:47.420 Script: Authenticating...
. 2025-04-01 14:01:47.420 Host key matches configured key fingerprint
. 2025-04-01 14:01:47.420 Initialised AES-256 SDCTR (unaccelerated) [aes256-ctr] outbound encryption
. 2025-04-01 14:01:47.420 Initialised HMAC-SHA-256 outbound MAC algorithm
. 2025-04-01 14:01:47.467 Initialised AES-256 SDCTR (unaccelerated) [aes256-ctr] inbound encryption
. 2025-04-01 14:01:47.467 Initialised HMAC-SHA-256 inbound MAC algorithm
. 2025-04-01 14:01:47.498 Reading key file "C:\SFTPKey\prod.ppk"
! 2025-04-01 14:01:47.498 Using username "username".
< 2025-04-01 14:01:47.498 Script: Using username "username".
. 2025-04-01 14:01:47.545 Server offered these authentication methods: publickey,password
. 2025-04-01 14:01:47.545 Offered public key
. 2025-04-01 14:01:47.607 Offer of public key accepted
! 2025-04-01 14:01:47.607 Authenticating with public key "rsa-key-20250124"
< 2025-04-01 14:01:47.607 Script: Authenticating with public key "rsa-key-20250124".
. 2025-04-01 14:01:47.654 Sent public key signature
! 2025-04-01 14:01:47.701 Further authentication required
< 2025-04-01 14:01:47.701 Script: Further authentication required
. 2025-04-01 14:01:47.701 Further authentication required
. 2025-04-01 14:01:47.701 Server offered these authentication methods: password
. 2025-04-01 14:01:47.701 Prompt (password, "SSH password", <no instructions>, "&Password: ")
. 2025-04-01 14:01:47.701 Prompting user for the credentials.
. 2025-04-01 14:01:47.701 Prompt cancelled.
. 2025-04-01 14:01:47.701 User aborted at password prompt
. 2025-04-01 14:01:47.701 Attempt to close connection due to fatal exception:
* 2025-04-01 14:01:47.701 **Credentials were not specified.**
. 2025-04-01 14:01:47.701 Closing connection.
< 2025-04-01 14:01:47.701 Script: Credentials were not specified.
< 2025-04-01 14:01:47.701 Authentication log (see session log for details):
< 2025-04-01 14:01:47.701 Using username "username".
< 2025-04-01 14:01:47.701 Authenticating with public key "rsa-key-20250124".
< 2025-04-01 14:01:47.701 Further authentication required
< 2025-04-01 14:01:47.701

< 2025-04-01 14:01:47.701 Authentication failed.