I'm an idiot - didn't realise I had to use both my master password AND YubiKey. Please close this thread.
Hello, I followed the steps on this page to set up a Yubikey with my KeePass database. I followed all steps correctly and carefully and now get the following message when I try and access my KeePass DB: **(filepath) Failed to load the specified file! The master key is invalid! Make sure that the master key is correct and try it again.** I get this message whenever I try and access my DB via YubiKey challenge-response OR my master password now. I'm completely locked out. Can someone PLEASE help me...