Please, log out then try clearing your cache or logging in with a different browser. 

Please see this TurboTax FAQ for information on how to clear your cache:

https://ttlc.intuit.com/replies/3302272

has this worked for anyone? Even after contacting Intuit this issue did not resolve but you expect it to work by clearing cookies?

Anyone looking for answer, please dont waste time here as this will not resolve the issue. Move to another site because even support desk wont be able to resolve your issue. Save yourself some misery and effort and dont use Turbotax because software will suddenly stop working and there is nothing anyone can do or rather anyone wants to do

This is WAY too much crap for me to go through just to use an application.  You need to fire all the dummies you hired to create this dumb stuff.  I bought the app and i should be able to use it EVERY **bleep**ING TIME i open it. Period.  Just like EVERY OTHER APPLICATION ON THIS COMPUTER.  

FIX IT SO I CAN USE IT AT WILL!  TODAY!  WITHIN THE NEXT FEW MINUTES, OR ALL THE USERS YOU HAVE MISTREATED WITH THIS ABSURD BEHAVIOR.  WE WILL GET YOU TO DO THE RIGHT THING BY PEOPLE WHO HAVE PAID YOU FOR YEARS.  WHOEVER GOT YOU PEOPLE TO COME UP WITH THIS KIND OF OFFENSIVE STUPIDITY SHOULD BE FIRED AND NEVER ALLOWED TO WORK FOR YOU AGAIN!!!!

FIX IT !!!

Lets create a class and sue them.  WE are the ones who pay THEM!  

All available activations for that code have been used. Error code: 603.

I AM THE ONLY ONE WHO HAS USED THE ACTIVATION. PERIOD.  FIX IT!  TODAY!!!