What do you mean by "another" S-corp? Did the Single Member LLC make an election to be taxed as a corporation?
If the Single Member LLC has NOT made the election to be taxed as a corporation, it is a "disregarded entity". That means you disregard it for income tax purposes. So it is the taxpayer that received the K-1.
In most cases the K-1 should have been issued to the taxpayer's name and SSN, so the S-corporation should correct that.
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