I have the same issue. Can't see that anything's wrong!
If you have TurboTax Online you can clear your cache and delete cookies. Also, try refreshing your browser and even try using a different browser.
Here are two articles below that will show you how to clear your cache and delete cookies.
How to clear your cache - Community
How do I delete cookies? - Community
If you have TurboTax CD/Download, please check for updates within the program.
You received an email that we cannot see that tells you why your tax return was rejected.
Some rejected returns can be fixed and re-filed. Some have “un-fixable” reasons for the rejection and have to be mailed instead. What is the rejection code or rejection message?
If it was rejected for AGI—-be aware that many 2020 returns took so long for the IRS to process that your 2020 AGI might not be in the IRS system. Try using zero instead.
If filing with zero is rejected then file again but select the option that you did not file last year. The IRS does not see that question and it will allow you to e-file with no AGI question.
https://ttlc.intuit.com/community/agi/help/where-do-i-correct-my-agi-in-turbotax-online/00/26311
If that does not work and you still cannot e-file, then print, sign, and mail your tax return.
Unable to send return to the Intuit Electronic Filing Center
Reason: Validation failed: difficulty recognizing the data in the return. I updated TurboTax program?
Try the steps here to identify the validation issue in TurboTax Desktop:
-Go to Forms Mode.
-Scroll through the forms list on the left.
-Click on any pages with red exclamation points next to them.
-Change what is indicated as needing review.
-Re-submit your return.