If you used desktop download software, the tax returns are not stored online; they were stored only on your own hard drive or any back up device you used like a flash drive.
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/find-last-year-tax-data-file-...
https://ttlc.intuit.com/turbotax-support/en-us/help-article/data-systems/find-tax-data-file-mac/L4VN...
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