Email Script Works on VS2015, But Not VS2017

Hello, all -

I have an email script that works fine and dandy on a box running VS2015. But, we will be losing those systems at some point and we have been given new laptops with VS2017 to use concurrently, until we lose the old laptops.

My email script is in VB.NET and leverages Outlook. It has two lines;

objDoc = OutMail.GetInspector.WordEditor
objBkm = objDoc.Bookmarks("_MailAutoSig")

that are used to grab the default signature and this works as it should on my box running VS2015. But, on the VS2017 version, when I hover the cursor over objDoc, the value shows as "Nothing."

My limited knowledge tells me that WordEditor is not working, for some reason, but I don't know why.

Might anyone be able to give me some assistance on what may be happening?

Thanx in advance for any help!