It can take a few minutes for your account to be approved. However, the most common reasons for non-approval are: 

• You are underage (you must be over 18)
• You have an invalid Social Security number
• You are not a citizen, resident of the U.S., or don’t have a valid U.S. visa
• Further documentation is necessary to validate who you are

Please keep an eye on your emails and check your spam folder.