TurboTax Error 103 with Vanguard typically indicates an invalid username/password, temporary server communication issues, or, frequently, that the 1099 data is not yet fully available for import, often occurring before mid-February. To resolve this, ensure you are using the primary owner's credentials, clear browser cache/cookies, and try typing "Vanguard" rather than selecting from the dropdown.
Make sure your Vanguard account settings allow "third party access" and you have disabled your anti-virus programs for importing. Since the IRS already has copies of all your 1099's, you could total any 1099-Int's from the same institution and make one entry, and consider using the Summary Method for 1099-B's.
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