So I figured out how to fix mine, but I'm not sure if it will work for others. Basically what I did was go to my email that my account was registered under and I searched for an old reset password email (thankfully I had one from like 2 days before) and I just reset my password with the link and now it works fine! I hope this helps!
This worked for me when I got error code 3. I did not use my email, but just the username. Instead of email@example.com, I just typed in username. Hopefully this works for others. (Note, this was for the app, not spotify.com)
I had this exact problem as well. I typically use Facebook to log in to my account. So all I had to do is go to fb.com reset the the password.. Then logged in using the same credentials as Facebook. Seemed to fix this issue!
I just signed up for premium, downloaded the application onto my macbook air. It won't let me log in. Error code 3. I tried every combination of username or full email. Even changed password. Changing your password requires the current password....... so why can't I log in. This needs to get fixed. Also can't log in on my phone. Do I have to wait to be charged in order to use spotify or something?