I am trying to access my 2020 return which was filed March 13, 2021. It is not showing up on my list of filed returns so I cannot access it to make changes.

I called Turbo Tax amd received an automated msg stating that my return was filed 3/13/21. I also did receive my refund as a direct deposit to my checking acct. Why can I not access my return to make the necessary changes to amend it?