two similar match/search functions, only one works

The error that you are getting is one presented when the value isn't available. Are you sure that the value that you are looking for in the first formula is actually in the range being searched?
Attach a sample workbook. Make sure there is just enough data to demonstrate your need. Include a BEFORE sheet and an AFTER sheet in the workbook if needed to show the process you're trying to complete or automate. Make sure your desired results are shown, mock them up manually if necessary.

Remember to desensitize the data. (Remove private or sensitive data that shouldn't be published)

Click on GO ADVANCED and then scroll down to Manage Attachments to open the upload window.
Click on Browse under Upload Files from your Computer and then find the file on your computer using the dialogue that opens. Click on Open then click on Upload. Click on Close this Window. Click on Submit.