Failed to get reply from Pageant - Server refused public-key signature despite accepting key!

SessionOptions sessionOptions = new SessionOptions();
if (loginPPK != null)
{
    sessionOptions = new SessionOptions
    {
        SshPrivateKeyPath = loginPPK,
        PortNumber = port,
        HostName = hostName,
        UserName = userName,
        Password = password,
        Protocol = Protocol.Sftp,
        SshHostKeyFingerprint = sshFingerprint
    };
}
else
{
    sessionOptions = new SessionOptions
    {
        PortNumber = port,
        HostName = hostName,
        UserName = userName,
        Password = password,
        Protocol = Protocol.Sftp,
        SshHostKeyFingerprint = sshFingerprint
    };
}
 
if (useOldSCP)
{
    sessionOptions.AddRawSettings("SFTPMaxVersion", "3");
}
 
using (WinSCP.Session session = new WinSCP.Session())
{
    session.SessionLogPath = logPath;
 
    // Connect
    session.Open(sessionOptions);
 
    // Download files
    TransferOptions transferOptions = new TransferOptions
    {
        TransferMode = TransferMode.Binary,
        FileMask = fileMask
    };
 
    TransferOperationResult transferResult;
    transferResult = session.GetFiles(remotePath, localPath, false, transferOptions);
 
    // Throw on any error
    transferResult.Check();
    results.Success = transferResult.IsSuccess;
}

2023-10-11 13:48:40.242 Reading key file "C:\local\Temp\jobs\triggered\PROGRAM\KEYS\key_name_priv.ppk"
. 2023-10-11 13:48:40.262 Pageant is running. Requesting keys.
. 2023-10-11 13:48:40.262 Failed to get reply from Pageant
! 2023-10-11 13:48:40.262 Using username "*******".
< 2023-10-11 13:48:40.273 Script: Using username "*******".
. 2023-10-11 13:48:40.320 Server offered these authentication methods: publickey,password
. 2023-10-11 13:48:40.320 Offered public key
. 2023-10-11 13:48:40.382 Offer of public key accepted
! 2023-10-11 13:48:40.382 Authenticating with public key "rsa-key-20180709"
< 2023-10-11 13:48:40.382 Script: Authenticating with public key "rsa-key-20180709".
. 2023-10-11 13:48:40.712 Sent public key signature
! 2023-10-11 13:48:40.835 Server refused public-key signature despite accepting key!
< 2023-10-11 13:48:40.835 Script: Server refused public-key signature despite accepting key!
. 2023-10-11 13:48:40.851 Server refused public-key signature despite accepting key!
. 2023-10-11 13:48:40.898 Server offered these authentication methods: publickey,password
. 2023-10-11 13:48:40.898 Prompt (password, "SSH password", <no instructions>, "&Password: ")
. 2023-10-11 13:48:40.898 Prompting user for the credentials.
. 2023-10-11 13:48:40.914 Prompt cancelled.
. 2023-10-11 13:48:40.914 User aborted at password prompt
. 2023-10-11 13:48:40.914 Attempt to close connection due to fatal exception: