I have filled my tax refund on 24th Jan 2023 and it got approved but I gave not received my refund yet. Can you please let me know why my refund is stuck?

Saying what is happening to your return at the IRS would be speculation. All you can do now is, wait. At least you know that the IRS has your filing. It does not matter who sent your form to them. That is the sole destination for federal tax returns. No one has discovered a way to make any tax agency speed up working on or sending out refunds. No one ever will because they are an overwhelmed, over worked, under funded and under staffed government bureaucracy. Eventually you will get the pay off of your no interest loan to the government. 21 days is just an educated/informed guess which should not be relied on as you well know. Have you thought of paying just enough by estimates or withholding to avoid a penalty and let the government wait for your check?  

  Check https://www.irs.gov/wheres-my-refund   

call the IRS though at this time of the year you may need to make multiple attempts or have long hold times  

1. Call 1-800-829-1040 between the hours of 7:00 AM – 7:00 PM local time.
2. Press “1” for English or “2” for Spanish.
3. Press “2” for “answers about your personal income taxes.”
4. Press “1” for “questions about a form you have already submitted or a payment or to order a tax transcript.”
5. Press “3” for “all other questions about your tax history or payment.”
6. Press “2” for “all other questions about your tax history or payment.”
7. Do not input your Social Security Number when the recording tells you to.
8. Press “2” for “personal- or individual-tax related question.”
9. Press “3” for “all other inquiries.”

10. Wait to be connected to someone at the IRS