I had the same problem as @VickiC. None of my business rental properties or royalties transferred from the 2023 TTax file. I finally was able to transfer these over using the approach of @VolvoGirl. I transferred my 2023 file to another computer, opened it in TTax2023 and verified that it had all the properties. After saving this file I then transferred it back to my original desktop in a folder different from the original one. When I imported from there into the 2024 TurboTax these properties did transfer over successfully. Thanks to VolvoGirl for the suggestion! (I am using the Home & Business version in both years.) Although this worked, it shouldn't have been necessary. I haven't had this problem before in the last 4 years, so something is clearly different this year. Here's hoping the TurboTax development team looks into this.