ND locks thick door

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The keycam may have failed, example here, the latest design keycam can be easily identified as the colored changed to black. Replace either the keycam or chassis as needed...
 This could also happen if the tailpiece isn't installed in a KIL, FSIC, or SFIC cylinder.  The FSIC driver also could have come loose from the core in the spindle.
Schlage ND-Series tailpieces for extended doors are available by only two means, but are not available to order separately.   If an extended tailpiece is needed, then a complete lock ...
Only the chassis components are modified for thicker door applications, the lever and spindle assemblies remain intact.  The following parts may be modified depending on the function of the lock ...
The AL and ND locks are not available in any stainless steel finishes.  The only option is either the 626 satin chrome or 625 bright chrome.
ND locks can be extended up to 6" Extended Outside.  
The 8190 can be order as a standard for 2 1/4" door thickness. Specify the door thickness to get proper mounting hardware.
The 09-611 indicator stands off the door 0.39".
The pricebook suggests (for a 1-3/4" door) using a 1-3/8" cylinder when installing with an 09-611 occupancy indicator.