It sounds like you logged into the wrong online account. Try all those links posted above. Then to do 2024 you need to transfer from the .tax2023 file on your computer.
You will need the data file ending in .tax2023 to transfer into 2024 either to the Online version or the Desktop program. Are you on Windows or Mac? Be sure to save your return (go up to File-Save or Save As) and know where it is and it's name. On Windows it should be in your Documents in a Turbo Tax folder. And you should copy it to a flash drive or backup incase your computer crashes.
If you already started an online return you will have to clear it and start over to transfer. How to clear and start over
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-clear-and-start-over-in-turbotax-onli...
If you used the Desktop program last year here’s How to transfer into the Online version. You need to have the prior year .tax2023 file on your computer. Expand the link if you used the Desktop software last year........
https://ttlc.intuit.com/turbotax-support/en-us/help-article/import-export-data-files/transfer-last-y...
