They are currently not available on turbotaxonline.com
https://ttlc.intuit.com/turbotax-support/en-us/help-article/import-export-data-files/save-2021-turbotax-online-return-pdf/L8dHfRkpT_US_en_US?uid=m7e64td0
If you used desktop download software, the tax return is stored on your own hard drive.