Please make sure any additional security protection features like 2-factor authentication are disabled before connecting to Digit.
Sometimes you may need to clear your list of known computers in order to allow Digit to connect your account. You can do that by clicking the following selections in your USAA account:
Step 1: Visit the Security Center
Step 2: Select 'Manage Preferences'
Step 3: Click 'Clear Your List of Recognized Computers'
Step 4: Select 'Yes'
Step 5: Try connecting to Digit again at https://digit.co/signin ; Please contact us if you're still having any issues, we're happy to help!