You have created an account, but you need to verify your email.
Please check your email for a verification link which you will need to click on before logging in for the first time.
If you don’t see it in a few seconds, check your junk folder. On four test emails, one went to a junk folder, so it does happen. The test where the email went to the junk folder involved an SD78 email and Outlook, and it took several minutes to show up, so please be patient.