There are multiple reasons why you may not be able to withdraw, here are some of them: 

• You have uncleared USD deposits 
• You have unsatisfactory deposits that result in a negative USD balance 
• Your funds are tied up in crypto assets, you must liquidate to USD to withdraw 

If you need additional information or assistance, please submit a Support Ticket through the "Help" section of the app or contact us at support@investvoyager.com.