OK, a couple questions for you. First, do you have the key with the buttons on it to lock and unlock the doors and the panic button? Second, I think you have to turn the key on and off eight times in under ten seconds and end in the "RUN" position. At that point the doors should lock and unlock to signal programming mode. I think you have to have the doors locked to start this procedure. Also, I think you need to have all the keys present in order to program.
I just did this recently on my truck and had no problems. OH, the double sided butyl taper will hold. I had one of these on my 2001 and it worked great.
2012 F550XL 19,500gvw, Oxford White/Steel interior, 6.7psd, Stainless simuators, Sync, 16Ft Morgan body, Waltco tuckaway 2500 lift gate.
2011 F250 CC Lariat Ultimate, Royal Red/Pale Adobe, 18" wheels, 3.31 locker, 172"WB factory Nav/Sync,etc.
Also have a 1997 F450 7.3 XLT with 14' box, Hypertech programmer
1987 F350 6.9 Banks Sidewinder, 12' box
Still going at 200K+
Traded:08 F250 CC 4x4 Lariat, 172"WB
Traded:01 F350 CC 4x4 Lariat, 172"WB