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You have defined three columns in the INSERT INTO statement – but the SELECT only provides two.
Change your code to so you’re not inserting values into your IDENTITY column:
-- NOT NEEDED! SET IDENTITY_INSERT #TEMPTABLE ON;
INSERT INTO #TEMPTABLE(CARDNO, OFFICEPUNCH)
SELECT CARDNO, OFFICEPUNCH
FROM [Tempdata]
-- NOT NEEDED! SET IDENTITY_INSERT #TEMPTABLE OFF;
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solved SQL – Temptable Identity Column not working [duplicate]