> What exactly is the backport status for this issue, and is there anything with more info for this user?

Python 3.6 has been in the security-fix-only phase of its life cycle since 2018-12 which means that python.org binary installers for Mac or Windows platforms have not been produced since then. If at all possible, your user should upgrade to a fully-supported version, currently either Python 3.9.1 or 3.8.7 (https://www.python.org/downloads/). That said, the last python.org macOS installers for 3.6, 3.6.8, still work for me on the most recent macOS Sierra update (10.12.6) including the "Install Certificates Command".  Make sure the user has admin privileges or that "Install Certificates Commnad" is run under a user that does have admin privs. If it still fails, you could try downloading and re-installing Python 3.6.8 or give more information about exactly what error is being seen.  But this sort of problem is really off-topic for this issue; better to ask in a help forum.