It says on the tax home page "Ready To Mail" not sure what that meant but why can't I track my refund? Why did the AI said that I haven't filed my return this year yet?

“Ready to mail”or “Printed”  means that your tax return has not been filed.  Either you could not e-file for some reason , or you chose to file by mail.  OR if you really did already mail your return, the software does not have any way to know that you put your return in an envelope and took it to a mailbox, so it will always say “ready to mail” in your online account.

TurboTax does not mail your return for you.  You have to print it, sign it, and mail it yourself.  When you mail a tax return, you need to sign it where it says "Sign Here" and write in the date you signed it by the word "Date".  Attach copies of your W-2 and any other documents that show taxes withheld to the left side of the papers where it says "Attach Forms..."

When you print your return, it will print with filing instructions that tell you where to mail it.  Pay careful attention to the address you mail your return to —federal and state returns do not get mailed to the same place.

It is not required, but is a good idea, to use a mailing service that will track your return or provide you with a receipt showing that the IRS got it--such as Fedex, UPS, or certified mail.  It will take about 4 weeks and then you can track the status of your return at the IRS website.

You can print your return by following the instructions below

https://ttlc.intuit.com/community/printing/help/how-do-i-print-and-mail-my-return-in-turbotax-online/00/26258

To send your tax return by mail and get a receipt to see that the IRS and/or your state received it:

https://www.usps.com/taxes/welcome.htm

To track your Federal refund:   

https://www.irs.gov/refunds

To track your state refund:    

https://ttlc.intuit.com/questions/1899433

On the IRS site you are also offered the use of an app called IRS2Go

To change to e-filing:

https://ttlc.intuit.com/community/e-file/help/how-do-i-change-from-mail-to-e-file-in-turbotax-online/00/26985

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@ upech wrote:
I e-filed my tax return for the first time since April 4th and it's been more than a month that I still haven't receive my refund yet. The most frustrating thing is I can't tracks it either on both IRS and TurboTax website. The AI Assistance on TurboTax said: "It seems like you haven't filed your taxes yet this year" but that doesn't make sense when my home page says: "Way to go, You filed your 2021 taxes." and "FEDERAL PRINTED" "READY TO MAIL" Did I miss something? What else am I supposed to do?

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If the status at the Tax Home says  "Ready to mail", it has NOT been efiled.  TurboTax thinks you plan to print, sign, and postal mail the return.   If you didn't physically print and postal mail it, then it has not been filed at all.  It sounds like you may not have gone to the final screen to transmit the return by efile.

If you haven't filed at all (i.e., didn't file by mail), you can still efile it.  You can open the return interview back up,  and change the filing method to efile.  

• Log into your account, and at the Tax Home or in the section "Your Tax Returns & Documents" for 2021, look for a link "Add a State."
• Click on "Add a State."  (That doesn't really add one; that's just to open the return.)
• Once the return is open, go through the REVIEW section to be sure everything is still in order.
• Then go to the FILE section, go through the screens there, and change the filing method to efile.
• Then continue on answering all the remaining screens and at the final step click a big orange button "Transmit Returns Now."

This FAQ may also have some info that will help:

FAQ:  How do I change from mail to efile in Online TurboTax?

https://ttlc.intuit.com/community/e-file/help/how-do-i-change-from-mail-to-e-file-in-turbotax-online...

It says ready to mail but then it says i have not filed yet