manually entering color code in fill for a title doesn't work, you must go and copy that code and then paste it.
When I go to update my text color to match previous titles, I manually type in my color e.g. 0A2CF6 - and it doesn't take. If I paste that same code, it will work.
I tried this using the value you provided: 0A2CF6
At first I could see a problem, but then I realized that when I typed it in I was entering a O (capital letter o) at the start instead of a 0 (zero), which is not a valid hex value for color. Is it possible you were doing the same?