A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
MATCH(Sheet1!$A12,$C:$C) returns an index number such as 37 or 5. That is not a valid hyperlink target.
If you want to link to the first cell in column C that has the same value as Sheet1!$C12, you can use
=HYPERLINK("#C"&XMATCH(Sheet1!$A12, $C:$C), "K")