Originally Posted by
moni1590
I had the same email on both accounts and looks like that's why I was getting the error message. Try changing the email address on your avios.com account.
OMG this literally fixed it! Chatted with an Avios agent and he changed my username und email. I logged into Vueling without any problems afterward. I tried fixing this for 4 months so THANK YOU!
So sad though that after so many calls and emails nobody at Vueling could fix this.