all axis mapping does is send the axis value, a range from -1 to 1. 1 being forward axis (or right on Y) and -1 backward (or left on y) and values in between represent slower movements. and 0 no movement of course.
make sure you are setting the walk speed on the correct actor (check your print is returnin the correct character to be sure also)
But, this is not a good way to control none player pawns. You really should look into AI controller. Or create your own code for movement. i find things get a little messy when trying to adapt the player controlled characters.
Have a look at this, Ryan has some pretty good tutorials normally so see if it helps.
Unreal Engine 5 Tutorial - AI Part 1: Character Setup - YouTube