The formula is messy, but try:
<b>Excel 2003</b><table cellpadding="2.5px" rules="all" style=";background-color: #FFFFFF;border: 1px solid;border-collapse: collapse; border-color: #A6AAB6"><colgroup><col width="25px" style="background-color: #E0E0F0" /><col /><col /><col /><col /><col /><col /><col /><col /><col /><col /><col /><col /><col /></colgroup><thead><tr style=" background-color: #E0E0F0;text-align: center;color: #161120"><th></th><th>A</th><th>B</th><th>C</th><th>D</th><th>E</th><th>F</th><th>G</th><th>H</th><th>I</th><th>J</th><th>K</th><th>L</th><th>M</th></tr></thead><tbody><tr ><td style="color: #161120;text-align: center;">1</td><td style="background-color: #FFFFFF;;">29Y421</td><td style="background-color: #FFFFFF;;">19A216</td><td style="text-align: right;border-right: 1px solid black;background-color: #FFFFFF;;">TRUE</td><td style="text-align: right;border-left: 1px solid black;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td></tr><tr ><td style="color: #161120;text-align: center;">2</td><td style="background-color: #FFFFFF;;">9N6J-12P412-AT</td><td style="text-align: right;background-color: #FFFFFF;;"></td><td style="text-align: right;border-right: 1px solid black;background-color: #FFFFFF;;"></td><td style="text-align: right;border-left: 1px solid black;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td></tr><tr ><td style="color: #161120;text-align: center;">3</td><td style="border-bottom: 1px solid black;background-color: #FFFFFF;;">4R8Q-19A216-AC</td><td style="text-align: right;border-bottom: 1px solid black;background-color: #FFFFFF;;"></td><td style="text-align: right;border-right: 1px solid black;border-bottom: 1px solid black;background-color: #FFFFFF;;"></td><td style="text-align: right;border-left: 1px solid black;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style=";">Not Ok because the number is Unknown</td></tr></tbody></table><table cellpadding="2.5px" rules="all" style=";background-color: #FFFFFF;border: 1px solid;border-collapse: collapse; border-color: #A6AAB6"><thead><tr style="background-color: #E0E0F0;text-align: center;color: #161120"><th><b>Sheet4</b></th></tr></td></thead></table><br /><br /><table width="85%" cellpadding="2.5px" rules="all" style=";border: 2px solid black;border-collapse:collapse;padding: 0.4em;background-color: #FFFFFF" ><tr><td style="padding:6px" ><b>Worksheet Formulas</b><table cellpadding="2.5px" width="100%" rules="all" style="border: 1px solid;text-align:center;background-color: #FFFFFF;border-collapse: collapse; border-color: #A6AAB6"><thead><tr style=" background-color: #E0E0F0;color: #161120"><th width="10px">Cell</th><th style="text-align:left;padding-left:5px;">Formula</th></tr></thead><tbody><tr><th width="10px" style=" background-color: #E0E0F0;color: #161120">C1</th><td style="text-align:left">=ISNUMBER(<font color="Blue">SUMPRODUCT(<font color="Red">--(<font color="Green">NOT(<font color="Purple">ISERROR(<font color="Teal">INDEX(<font color="#FF00FF">A:A,MATCH(<font color="Navy">"*-"&$B$1&"-*",A:A,0</font>)</font>)</font>)</font>)</font>),--(<font color="Green">ISNUMBER(<font color="Purple">SEARCH(<font color="Teal">"Not Ok",INDEX(<font color="#FF00FF">M:M,MATCH(<font color="Navy">"*-"&$B$1&"-*",A:A,0</font>)</font>)</font>)</font>)</font>),--(<font color="Green">ISNUMBER(<font color="Purple">SEARCH(<font color="Teal">"Unknown",INDEX(<font color="#FF00FF">M:M,MATCH(<font color="Navy">"*-"&$B$1&"-*",A:A,0</font>)</font>)</font>)</font>)</font>)</font>)</font>)</td></tr></tbody></table></td></tr></table><br />