The most common issue with PIN numbers is mistaking two characters that look alike, for instance a capital "i" might actually be a lowercase "L" or the number "1".  Similarly, the letter O can look like the number zero.  Are there any characters in your PIN code like this?  When you enter the PIN correctly in XOGO Manager that field will actually disappear while you enter the other fields like the player name, time zone, which playlist you want it to play, etc. Then as soon as you click save you'll see the blue spinning ball on your player, and your content will begin playing a few seconds later.