Cant register NIS

norton internet secuity version 21,1,0,18

i am trying to enter my product key which keeps failing with an error code 8505,100

.when i try add a device in my account all what happens is i download a download manager, then what ?

i have no devices added in my account ,i can not log into my account via the NIS program

Iam unable to set up identity safe because it doesn`t recognise my email or password ? 

any ideas thanks