The TEXTJOIN formula may not be working on your system if you’re having a version of Excel that doesn’t support this formula. TEXTJOIN is only available in Excel 2019 and later.

CONCAT and TEXTJOIN were added to Excel in 2019, so if you're using an older version, you might not have access to these functions.

Modern Excel functions like XLOOKUP, TEXTJOIN, and dynamic arrays offer faster, more versatile, and error-resistant alternatives to outdated tools such as VLOOKUP, CONCAT, and OFFSET.