Stock symbol SKHY is missing in Excel's Stock data type

This is most likely a data-provider coverage gap, not an Excel formula issue. Use Excel's in-product feedback path from File > Feedback > Send a Frown, include the ticker `SKHY`, the exchange, the security name, and a screenshot of the Stocks data type returning no result. Also test the company name rather than only the ticker, because newly listed ADRs can appear under a different searchable label before the ticker mapping is complete. Until it is added, keep the ticker as plain text in your workbook and avoid building formulas that assume the Stocks data type will resolve it immediately.