Hello. the IRS is saying that my documents may not have been recieved through mail

Did you physically mail the Federal return?  TurboTax does not mail anything for you.    Did you happen to mail by any method that has tracking, such as certified return receipt or Priority Mail?

Hopefully, you mailed the Federal return and state return separately to the relevant tax agencies, and that you did not mail them together in one envelope only to the state agency.    Did you mail the returns separately?

Your TurboTax account will always says "ready to mail" since it has no way of knowing if you actually mailed the returns or not.   TurboTax does not get any feedback from the IRS in regard to a mailed return.