Did you use the CD/download? Your tax files are not stored online. They are on your own hard drive. It sounds like you are trying to log in to an online account. That is the wrong place to look for your return if you used the CD/download.
https://ttlc.intuit.com/questions/1901659-find-your-tax-data-file-in-mac
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/find-last-year-tax-data-file-...
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