The IRS releases most refunds within 21 calendar days after the e-filed return has been accepted (received), not 21 days from the e-filing date. The only way to know when your refund will be released is to use the IRS Where's My Refund tool.
Until the IRS starts processing your return, you may not find record of it or the website may say that you have put in incorrect information when tracking your federal refund. As your return moves through the system, the status of it will be updated accordingly. Please see here for more information on checking the status of an e-filed return.
If accepted by the IRS use the federal tax refund website to check the refund status as it moves through the process here.
See the video in this link for a really good explanation of the process:
https://www.refundschedule.com/irs-wheres-refund-status-bars-disappeared/
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