Sounds like you were trying to AMEND 2019 online which can be done. BUT BUT if your original 2019 returns rejected they were not filed so you do not amend. You just fix it and mail in the original return. You will have to use the Desktop program. See, How to finish a return you started online
https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-finish-a-prior-year-return-that-i-...
If you started amending it you might have a mess. You will need to delete the amended return.
Oh by the way, if you install the 2019 program.......After you get the program installed the first thing to do before you open your tax return is to update the program and install any state programs you had. So you first might need to start a fake return to be able to download the state program (go to FILE - New)
Then you just OPEN the .tax2019 file, go up to File-Open. You don't import or transfer it.
