Raycast is not hitting the first person controller, but works fine with third person character controller

I'm making a game that lets you swap between first and third person, and in it the enemy is made to check line of sight using a raycast (in the same way as the stealth tutorial enemies) to see if there is anything in the way of seeing the player. This all works fine in third person when there is an actual model for the player, but when in first person and just using the first person controller the raycast does not register as hitting it. I've tried looking with the debug drawray but it's not given me much more information. When I've tried looking it up people have usually had the opposite problem!

The playerInSight variable does not get set to true when I'm in first person.

here is the method that includes the raycast:

 void OnTriggerStay (Collider other)
 {
     // If the player has entered the trigger sphere...
     if(other.gameObject.CompareTag("Player"))
     {
         playerDistance = Vector3.Distance(other.transform.position + transform.up, transform.position + transform.up);
         // By default the player is not in sight.
         playerInSight = false;
         
         // Create a vector from the enemy to the player and store the angle between it and forward.
         Vector3 direction = other.transform.position - transform.position;
         float angle = Vector3.Angle(direction, transform.forward);
         
         // If the angle between forward and where the player is, is less than half the angle of view...
         if(angle < fieldOfViewAngle * 0.5f)
         {
             RaycastHit hit;
             
             // ... and if a raycast towards the player hits something...
             Debug.DrawRay(transform.position + transform.up, direction.normalized*30, Color.red, 0.1f, true);
             if(Physics.Raycast(transform.position + transform.up, direction.normalized, out hit, col.radius*20))
             {
                 // ... and if the raycast hits the player...
                 if(hit.collider.gameObject.CompareTag("Player"))
                 {
                     // ... the player is in sight.
                     playerInSight = true;
                     
                     // Set the last global sighting is the players current position.
                     lastSighting = other.transform.position;
                 }
             }
         }
     }
 }