How to Fix Power BI LOOKUPVALUE Error When Keys Match No Rows

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Power BI users encounter a 'key didn't match any rows' error when the LOOKUPVALUE() function finds zero matching values in the target column, as opposed to the duplicate-value error where too many matches exist. The four main causes are data type mismatches between columns, trailing whitespace or case differences in text keys, lookup values that genuinely no longer exist in the dimension table, and a missing default value in the DAX formula. Analysts are advised to first identify which specific keys are absent using a membership check, then trace the mismatch back to its source rather than patching only the formula. Common mistakes include assuming the issue stems from a modeled relationship in Power BI's Model view, when the error is specific to DAX functions like LOOKUPVALUE(). A proper fix involves aligning data types, trimming and normalizing text keys at the data origin, and making a deliberate modeling decision about how to handle historically absent dimension records.

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