Finally got through to someone who was able to correct the issue. Not sure if they just did it manually or got the coupon fixed, but I got the order completed.   Hopefully they will point out the issue and someone will correct the wording or placement of the coupon ad.  
I tried to purchase an Alienware monitor (AW3420DW) and use the additional 5% off when financing president's day coupon that is advertised all over the president's day deal page (including the monitor deals) and it won't work. I chatted with sales who proceeded to tell me that it only worked on a few accessories. The coupon fine print doesn't say that. It does say it doesn't work on Dell Monitors which I assume is because of the free gift card offer with the Dell monitors. It does mention not working on doorbusters, but are all the president's day deals doorbusters? The coupon details page has a link under the 5% off coupon directly to the president's day deals. Seems very misleading and frustrating. The sales rep I chatted with also tried to pass of free expedited shipping as a special concession to close the sale when this is already a discount you get with Dell rewards. I only recently opened a Dell Account (never bought from here before) but I'm not impressed and rather concerned.
Misleading President's Day Coupon