I also experienced a temporary error when refreshing the link I got from the email to claim WOF in the free spins there because the captcha didn't appear perfectly and an error message appeared so I had to refresh the page and finally I could claim it again, but if you still continue to experience this, that's it. an expired link means that your WOF link has expired, as far as I know it is only valid for 48 hours of WOF sent via email, usually if it has passed 48 hours the link will expire, so far I claim to have never had a problem with expired links except for the error I mean above, hopefully this answers your question or try again in the next few hours