Have you imported Coinbase / BTC transactions into TurboTax Premium Online?
I read the message as saying that the transactions imported show a withdrawal of BTC greater than the deposits of BTC. Are there other wallets or exchanges that need to be imported?
You may select View transactions to see the imported transactions. At the screen Here's what we got, take a close look, select What should I pay attention to?
Checking your imported transactions to the right states:
When TurboTax imports info from your crypto service, transaction details might not always be reflected accurately. We’ve outlined some of the situations where this occurs here. Be sure to check your list of transactions and make any changes necessary for them to be reported accurately on your tax return.
Within TurboTax Premium Online, click on each hyperlink to for explanations for each error possibility.
Click on the box to the left of a transaction and Bulk Ignore and Bulk Edit functions become available. Transactions may be reviewed / added / edited to correct the imported transactions. The funnel icon may be used to sort transactions.