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Why don't all of the accounts I have added appear available for transfers?
Your account(s) can only be enabled for External Transfers after being verified with your financial institution. Once you select to External Transfer, check the Perferences page. If verification of the account is still pending, or if you have not begun the offline verification process, you will see the account listed under My Other Accounts with a status of Verify.
Once an account is verified, the account will have a status of Active. You can now schedule transfers from this account.