The problem with that approach is that there is only one owner of the account: ABC, LLC. XYZ, LLC does not own the account. The bank should not accept checks payable to XYZ, LLC for deposit into the account. The bank should not issue 1099s in the name of XYZ, LLC; they should be issued in the name of the account owner, ABC, LLC. If it is a disregarded entity (for tax purposes), there will be no problem with the TIN (no more than there would be if the LLC were owned by John Doe and used John Doe's TIN).
If the bank does something that makes it look like XYZ, LLC actually has an ownership interest in the account, the chances for employee error increase dramatically.
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