If you just signed up for Swan Force, it typically takes a couple of days for your custom URL to go live.
We have to double-check that no one else is already using your requested URL, and then twice per week, we do a site update to create the new URLs and send emails welcoming new Swan force members.
Please do not reach out to support unless it has been at least six days since you signed up. If that is the case, reach out to us via our help form.