Once 21 days has passed you can call them for a status.
Same had happened with me. When I called I was told I needed to submit form 8962 along with form 1095 - for marketplace insurance. When I filed with TT there was no prompt for me to complete the form.
Turns out this year there wasn't one but there was a place ( that we were just expected to know about) to click on to do so.
Once you fax the forms to the IRS they say it takes 6-8 weeks for your refund. It's been two weeks for me. At this point it's just a waiting game.
