The email you received will include the specific reason why your extension was rejected: Select the orange Fix my Extension link in your email. Sign in to TurboTax Online. Once you've signed in, select Fix my extension. Did you know? You might not need an extension if you're getting a refund.
Any time your extension is rejected, you can correct your extension application and resubmit it to the IRS at no additional charge. If you are notified that your extension was rejected and the deadline has already passed, keep in mind that you still have time (up to 5 days) to modify and resubmit your extension.
Please see the below link to file an extension.
For assistance with fixing a rejected return, click here.
My extension was also rejected. I fixed the error (I believe) and resubmitted. What happens if my extension is rejected after the April 18th deadline has passed?
Please see this Turbo Tax help article.
What can I do if I filed an extension before the filing deadline but it was rejected?
https://ttlc.intuit.com/community/extensions/help/what-can-i-do-if-i-filed-my-federal-new-york-or-massachusetts-individual-extension-before-the-filing/00/27605
My easy file turbo tax was rejected. I didn't see the rejection email until today and the 5 days have passed. What do I do now?
If you are asking how to file an extension for 2021, it is too late. Now your 2021 return is just late. If you are getting a refund then there is no penalty for filing past the deadline. If you owe tax due, your interest and penalties began on April 18, 2022. File asap and pay your tax due. The IRS will bill you later for any additional amount owed---it will not be calculated by the tax software.