System says to check entry "Schedule E Worksheet: Passive 4797 l/t loss must be entered", but I don't see it on the Schedule E Worksheet & don't understand what's needed

Did you sell a rental asset in 2024?

If you didn't sell any Rental Assets, you could enter $0, if leaving blank is generating a review check. Have you tried Continuing past the message?  Or you could delete Form 4797 from your return.  Here's How to Delete Forms in TurboTax Online. 

Passive Loss Carryovers for Rental Activities are not reported on Schedule E. You will find the carryover for prior years on Form 8582, Part VII, column c. If you have always made a profit, this number may be zero.

You can also see this carryover on the Schedule E Worksheet for your rental property. Look for "Carryovers to 2024 Smart Worksheet" (for a tax year 2024 return) after the QBI section under Line 22. The suspended loss is reported on Line G of this table.

While TurboTax normally transfers carryovers from last year to your current return, it's possible this function wasn't successful for you this year. But the forms should give you the entry you need.

Here's more info on Form 8582 Passive Activity Loss. 

@mr_jing