Excel add-in won't recognize credentials

Until recently, I was able to launch the SEI Excel add-in automatically.  I can no longer do that.  If I key in the user id and password, it fails.  I have done a cut/paste from a Word document to both the BI product and the add-in to remove my fat-fingering as a possibility.  We are using the ADMIN level user.

SEI BI works.  The add-in does not.

We recently had a problem where it was not resolving the server name correctly when connecting via a VPN and Tangerine tech support updated a Windows file to fix this.  The problem with the BI function (which had been failing) was resolved.  I only later discovered the add-in was not.

Any idea what we need to do to get past this?

TIA