Just worked for me. Have you tried again? Maybe there is a time lapse between registration and authorization to use. Just guessing.
'96' Dodge 3500, 5-speed, 3.54 LSD, Ext. Cab, 205,000 plus miles, K&N RE-0880 air filter, Jannety heat shield, TST #10 plate slid forward 1/8", AFC spring kit, 16 cm exhaust housing, Jardine 4" exhaust w/5" stainless steel tip, South Bend Clutch, SPA digital EGT and boost gauge, relay controlled back-up alarm and rear facing halogen tractor flood lights, air horns, bed liner, Tonnou cover, Geno's manual trans. filter, brite box. Dyno run 1-27-02; 375.6 hp and 798.3 ft. lb. torque at the rear wheels.