How can I get a JWT Access Token using Docusign 4.0.4.0 - jwt

Question

I have a legacy application written in VB6 (I Know!!) to which I am adding a DocuSign feature. I a using InterOp to run .NET code written is VS2019 VB.Net. The reason I am using 4.0.4.0 as this is the version I can successfully call using InterOp. I have all the code working except for requesting a JWT token. Does anyone have JWT code working under this version of the API ?
This is what I have working under later versions of DocuSign and am trying to replace
`Dim privatekey As Byte() = File.ReadAllBytes("docusign_private_key.key")
Dim result As Object = x.RequestJWTApplicationToken(gsSIGNERCLIENTID, docuSignAuthServer, privatekey, 1, scopes)
txtAccessToken.Text = result
'
' Second attempt at alternative
'
` Dim authToken As OAuth.OAuthToken = x.RequestJWTUserToken(gsSIGNERCLIENTID, gsUserIDGUID, docuSignAuthServer, privatekey, 1)
txtAccessToken.Text = authToken.access_token`
'
' Third attempt
'
Dim request = TryCast(System.Net.WebRequest.Create("https://account-d.docusign.com/oauth/token"), System.Net.HttpWebRequest)
request.Method = "POST"
request.Headers.Add("username", "user123")
request.Headers.Add("password", "123")
request.Headers.Add("auth_access_type", "read")
request.ContentLength = 0
Dim responseContent As String = ""
Using response = TryCast(request.GetResponse(), System.Net.HttpWebResponse)
Using reader = New System.IO.StreamReader(response.GetResponseStream())
responseContent = reader.ReadToEnd()
End Using
End Using
'
' Fifth attempt
'
Dim apiClient5 As New ApiClient(gsBASEPATH)
Dim authToken5 As OAuth.OAuthToken = apiClient5.RequestJWTUserToken(gsINTEGRATIONKEY, gsUserIDGUID, "https://account-d.docusign.com/oauth/token", privatekey, 1, scopes)
All results in 'Error while requesting server, received a non-successful HTPC code Error with response Body'

Answer 1

Your second attempt is correct:
Dim authToken As OAuth.OAuthToken = x.RequestJWTUserToken(gsSIGNERCLIENTID, gsUserIDGUID, docuSignAuthServer, privatekey, 1)
txtAccessToken.Text = authToken.access_token
AuthServer has to be "account-d.docusign.com"
The privateKey has to be the exact thing you got from DocuSign, including the new lines and all. To get it use this code:
File.ReadAllBytes(path) where path is the path on the disk to a plain text file with your private key.
gsSIGNERCLIENTID should be the GUID for the user that you use that has consent. You must make sure user gave consent by building a consent URL as explained in here:
https://developers.docusign.com/platform/auth/consent/obtaining-individual-consent/
If you did all of this correctly - it should work.