I received a CP80 stating that the IRS did not receive my 2020 Taxes, but I e-filed with Turbo Tax.

The IRS has sent out many of these notices even though the e-filed tax return was accepted by the IRS.

You will have to print and mail your signed tax return to the address listed on the CP80 notice.

To access your current or prior year tax returns sign onto the TurboTax website with the User ID you used to create the account - https://myturbotax.intuit.com/

Scroll down to the section Your tax returns & documents.  Click on the Year and Click on Download/print return (PDF)

A 2020 tax return can only be printed and mailed, it cannot be e-filed.

Print, sign, date and mail the tax return to the IRS.  Include with the mailed return any forms W-2 and 1099 which have taxes withheld.