Unfortunately I was unable to answer my phone for the call back.
However I was able to resolve my activation issue today by calling customer support.
I was directed to a support link (updated three weeks ago, thanks!)
https://turbotax.community.intuit.ca/turbotax-support/en-ca/help-article/install-products/trouble-li...
The tool in the support link for 2018 and earlier worked for me with a valid Installation Key I had with the original installation cd.
