If you are trying to import, try to enter the amount manually instead. Here's how to enter a 1099-INT into TurboTax Online manually:
1. Open TurboTax Online and navigate to Wages & Income > Investments and Savings (1099-B, 1099-INT, 1099-DIV, 1099-K, Crypto) > Add/Edit
2. Choose the button Add Investments
3. Under "Let's import", choose "Enter a different way."
4. Choose Interest, continue
5. Choose "Type it in myself"
Enter FEIN from payer, payer's name, and amount of interest. Choose recipient's name from dropdown box.