How to light both sides of a sprite

Hey there,

I am messing around with sprites in 3D, I cannot work out how to set it so if a sprite is in front of a light the front of the sprite it is also lit up.

Here is my example scene with the issue:

Character behind the light:

Character in front of the light:


I am using the ‘DefaultLitSprite’ material and have tried modifying it to get the result I want to no avail.
If anyone knows how I can make the light affect both sides of the sprite regardless of its position to it, I would be very grateful!

Many Thanks!