This is probably the cause of your missing refund check: The US Department of Education has the right to withhold your tax refund if you owe on a defaulted student loan.
This is referred to as a tax refund intercept. If this is happening to you, be sure to talk to a student loan lawyer immediately. It’s not too late to get your loan out of default and stop ED from intercepting your refunds. If you have any further questions regarding tax refund intercepts, contact me now.