I used to have Spotify connected to the last.fm scrobbling feature, and it worked fine until recently when i noticed it was no longer scrobbling, and when i went to turn it on again, it gives me a 'invalid username or password' message.
I'm 100% sure that it's the right login because i can log in to last.fm with it, and i suspect it's on spotify's end because scrobbling works just fine with foobar.
I also tried to change my password in last.fm and try the new one, but with no luck.
I have been unable to find the answer after scouring several forums, i have been able to find a few others with the same problem as me, though.
Solved! Go to Solution.
Just found the answer for that:
If your account is too old, and your password is weak (like "mypassword") you will give that error. Go to Last.Fm site, say that you forgot your password and receive the link to change password on your e-mail.
Change your password to a password with numbers and characteres (like "MyPassword123.@)
Then you won't get that error anymore.
This just worked for me