The reason is that Aesop has sent you a 'preferred sub alert.' You will only be able to accept the job through the email and the job won't be posted to the Aesop website yet. Sub Sidekick only detects jobs on the Aesop website, so therefore, you won't get an alert for anything they don't post on their site for all users to see. Aesop will wait for several hours to allow a preferred sub to accept the job. If no one accepts the job, then it will posted to the website for anyone to accept. If that happens, then you would receive an alert from Sub Sidekick.