Hello Manfred,
I admit that I had tried to use the 5-digit APRS-IS code. Then I tried the UI-View registration code and that failed as well.
I did get a direct email in response to the post though, telling me to use my call, the registration number, and my first name only (for some reason). This worked.
Not sure why it changed, but the issue is resolved.
Thanks to all for the suggestions and assistance.
73,
Rod VE7RJT