Hi, I am using the C# eSign SDK and am trying to allow users to open a sender view for envelopes that they are not the sender on, but have been granted shared access to. i.e. User A creates a draft envelope and User B opens the sender view for that envelope.

The documentation says I need to attach a header ( X-DocuSign-Act-On-Behalf) with the principal user id (User A’s id) as the value in order to act on their behalf.

Here’s what I am doing generally in my code (language is Visual Basic). I am using the agent user’s (User B) access token and base uri:

DSClient = New DocuSignClient(baseUri & "/restapi")
DSClient.Configuration.DefaultHeader.Add("Authorization", "Bearer " & accessToken)
DSClient.Configuration.DefaultHeader.Add("X-DocuSign-Act-On-Behalf", principalUserId)
...
EnvelopesApi.CreateSenderView(accountId, envelopeId)

The problem is when I add the header and make the API call, I get an error back:

{

errorCode: “ACT_ON_BEHALF_USER_NOT_ALLOWED”,

errorContent: "An 'Act on Behalf Of' user is not permitted for this operation."

}

I’ve double and triple checked that the envelope I am attempting to send is one that is in the principal user’s inbox AND that the agent user has the proper authorization through Shared Access (Permission is Send).

Am I getting the error because Shared Access is not supported by the API for the CreateSenderView endpoint? Or am I doing something wrong? Help would be appreciated.