Help with 4x4 on a 2002.

I read the manual and I understand how to put it into 4HI and back to 2LO. I cant get the lever to go past 4HI though. I put it in Neutral and it still doesn’t go into 4LO. It’s not a huge issue because I only use 4HI to get out of street parking due to the snow piles. I’m just curious to see if anyone’s got any advice or insight as to what I am doing wrong. It’s an Automatic transmission.