Check your 2018 tax return for a "Schedule B--Aggregation of Business Operations". That IRS-prescribed form for 2018 reporting will show the businesses you aggregated in 2018.
That will not fix the e-file problem, but at least you will know if you must aggregate in 2019 or instead have to option to not aggregate the businesses. That way, you won't spend time "un-aggregating" when it is not an option for your tax return.
@legendpeng
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