"an Issue on" signifies: "a question on the topic of" and so can only be applied when you can insert the phrase "the topic of" once the "on", whilst "an issue about" can applied before nearly anything. This may be explained to a member of the family or a pal https://beauyqgui.wikidirective.com/7656111/little_known_facts_about_hoodies_exporter_in_pakistan