The storyline takes the war running among the countries and in old eras like 1936, 1948, and so. For other paradox games, I've always used RGB numbers and it's worked fine, but it seems wonky for HOI4. Up-to-date help for the Hearts of Iron IV (PC) command tag_color. In the condition of a disabled game console, you just have to press the Shift+2, §, ~, `,^ or ALT+2+1 or Shift+3 to enabled the console.