Hey!
After several hours of troubleshooting I FINALLY found a solution for this.
Check your "Type" column. If there is a transaction that is labeled as "Fee", change it to "Expense" (without the quotation marks of course).
This obviously doesn't change the backend error on TurboTax' end of this, but it allowed me to upload my transactions.
TurboTax reps, if you're reading this: please report this error to the appropriate department responsible for this!
GOD BLESS! 😁
