In most cases, users who can't locate a return they've filed using TurboTax Online have more than one TurboTax account and don't realize it. In order to access a copy of a return, you must use the EXACT same login information (same username and password) that you used when preparing the return.
See the TurboTax FAQ linked below for instructions on how to proceed, as well as other possibilities to explore.
https://ttlc.intuit.com/community/accessing/help/why-can-t-i-find-my-return-in-tax-home-or-my-docs/01/25553
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