Gaving trouble getting the camera to move

I've been trying to get a camera to move to a fixed location for some time now.
I can't seem to get it to work.

I've read many entries & lsl wiki pages, but, for some reason, my script just won't work for me.

When I sit on a given object, I'd like the camera to go to a preset position
(In the future, assuming I can get this to work, I'll likely present a menu, but for now, 1 position will do.

Here is my script:

key kAvatar;

MoveCamera()
{
    vector vPos = llGetPos();
    llOwnerSay("Moving camera...");
    llSetCameraParams([CAMERA_ACTIVE, TRUE,    
                       CAMERA_FOCUS, vPos,              
                       CAMERA_FOCUS_LAG, 0.0,               
                       CAMERA_FOCUS_LOCKED, TRUE,      
                       CAMERA_FOCUS_OFFSET, <0, 0, -10>,
                       CAMERA_PITCH, -80.0,                       
                       CAMERA_POSITION_LOCKED, TRUE]);
}

default
{
    state_entry()
    {
        kAvatar = llGetOwner();
        llSitTarget(<0.25, 0.0, 0.80>, ZERO_ROTATION);
    }
    
    on_rez(integer nNum)
    {
        llResetScript();            // reset the script
    }
    
    changed(integer nWhat)
    {
        key kAvatar;
        if (nWhat & CHANGED_LINK) {
            kAvatar = llAvatarOnSitTarget();    // who is sitting ?
            if (kAvatar != NULL_KEY) {
                llOwnerSay("  kAvatar = " + (string) kAvatar);
                llRequestPermissions(kAvatar, PERMISSION_CONTROL_CAMERA);
            }
            else {
                llOwnerSay("No one sitting; reset camera");
                integer nPerm = llGetPermissions();
                if (nPerm & PERMISSION_CONTROL_CAMERA) {
                    llClearCameraParams( );
                }
            }
        }
    }
    
    run_time_permissions(integer nPerm)
    {
        if (nPerm &  PERMISSION_CONTROL_CAMERA) {
            MoveCamera();
        }
    } 

}

(I'm just trying to move the camera up and see change the angle.
Ideally, I'd like to move it to a give pos & rot that I obtained with
llGetCameraPos & llGetCameraRot, but I'll cross that bridge once I get this to work)

Can the camera doesn't move, I've tries changing almost everything.
I can still move the camera manually -- isn't that what the focus & position locks are supposed to prevent?

In any case, any help will be very appreciated.

Thanks in advance,
Xaq