Brian Roehm thank you for your question:
> How do you go about tracking down and fixing whatever pieces of a program like [Onprem Dynamics] GP (with so many things going on) are using the (very) soon to be deprecated protocol?
First, I should note that the known issues list in this blog is only a subset of Windows applications that rely on TLS 1.0/1.1. We have an outreach program that has already engaged with the developers of every application listed here, and more, and many owners have already responded with an updated version or a mitigation. We will soon post known issues in a more permanent MSLearn document page where we can update the list with additions, fixes, and resolutions.
We are taking a data-driven approach to this deprecation and will continue to engage with applications which pose a significant risk to customers. That being said, we cannot possibly engage with every single application developer in the ecosystem. We hope that spreading awareness with announcements like this one along with the upcoming Insider Preview release will spur both organizations and applications to make the switch. We strongly encourage customers to engage directly with application owners to ensure they are aware this change is coming and put the onus on them to provide a solution or workaround.