Hi all, I recently migration my extension management tools from 2019.1 to 2019.1. I create a new extension and I deployed it. When I go to extension manager to activate the extension, I am unable to see it. I have checked the roles that I have for customdeploy_ext_mech_installer_event and its proper.

I assume you mean to 2019.2. This version uses version targeting, so you will need to check/declare applicable versions in the manifest of the extension