当找不到锚字符串时，信封创建失败

Question

当信封仅包含一个标签时，该标签是可选的，必须与整个单词（AnchorIgnoreIfNotPresent = true 和 AnchorMatchWholeWord = true）匹配，并且文档，则返回异常：

errorCode: TAB_PAGE_NUMBER_NOT_SPECIFIED
message: Page number not specified in tab element. Page Number or AnchorTabItem missing for tab \"SignHere"\."

该选项卡由锚字符串而不是X / Y位置放置，该位置需要页码。以下是请求：

EnvelopeDefinition envDef = new EnvelopeDefinition
{
    EmailSubject = "Here is the email subject!",
    EmailBlurb = "Add this blurb!?",
    Documents = new List<Document>(),
    Recipients = new Recipients
    {
        Signers = new List<Signer>()
    }
};

Signer addSigner = new Signer
{
    Email = "fakeemail@email.com",
    Name = "Test User",
    RoleName = "Role Name",
    RecipientId = "1", // Recipient ID must be greater than 0
    Tabs = new Tabs
    {
        SignHereTabs = new List<SignHere>
        {
            new SignHere
            {
                DocumentId = "1",
                AnchorString = $"signerz1sig", // This anchor string does not exist.
                AnchorXOffset = ".25",
                AnchorIgnoreIfNotPresent = "true",
                AnchorMatchWholeWord = "true",
                AnchorUnits = "inches"
            }
        }
    }
};

envDef.Recipients.Signers.Add(addSigner);

envDef.Documents.Add
(
    new Document
    {
        DocumentBase64 = Convert.ToBase64String(request.Stream.ReadAsBytes()),
        DocumentId = "1",
        Name = "Mutual_NDA_1.pdf"
    }
);


envDef.Status = "sent";

EnvelopesApi envelopesApi = new EnvelopesApi(Configuration);
EnvelopeSummary envSummary = envelopesApi.CreateEnvelope(AccountId, envDef);

将AnchorMatchWholeWord保留为空时，请求成功。如果值为“ false”或“ true”，则它将失败。为什么会这样？