There are a few main reasons why this request button might be inactive:

  • You didn't check the box "I agree" about terms and conditions for the withdraw.
  • The amount you are trying to withdraw is less than the minimum required per transaction. 
  • You didn't inform the withdraw destination address - in case the address requires one
  • For XRP withdraws, you may need to inform a destination tag within the address informed in order to request the same