Tracking numbers from USPS and many other carriers do take anywhere from 24-48 hours to show/register online. The link to your tracking number we send you may not show an update when you receive initially or may show invalid. In most cases, the tracking number is not invalid and just hasn’t updated from our shipping carriers systems yet. Please make sure 3 days from the date of purchase has gone by before reaching out to us for support. Thank you for understanding!