Can you perhaps share a screen of your Inspector for the object with this script and relevant RigidBody 2D and Collider 2D?

Just quick basic thoughts to think of in case you missed something:

• For Collision, be sure "Is Trigger?" is disabled so physics collision is registered instead of triggered only.
• Is your Rigidbody 2D "Body Type: Dynamic"?
• Be sure your "Collision Detection: Continuous".
• Be sure your "Interpolate: Interpolate".
• Be sure the collider object is active when other object enters its field.