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Hi @KJ,
Thank you for your detailed information regarding the situation.
Based on your sharing, this is such a strange behavior since if the user is able to select the Find What field in "Find and Replace", he should be able to paste or add data there to do a search. However, you mentioned that Notepad shows "lots of spaces that came with the text", I suspect this is highly the culprit of the issue.
In Excel, Find & Replace and other search-related functions have an input limitation at 255 characters. If the data in that cell has lots of spaces when pasting into Notepad, it can inflate the length to exceed 255 characters, and Excel won't allow pasting it into Find & Replace. Combining with the details that it fails on another machine and Safe Mode, it helps proving the issue is the workbook content itself.
You can ask that user checking the length of that cell by using the formula =LEN(cell). If the result is larger than 255, that's the problem. Then you can use this formula to clean up the data: =TRIM(cell) to remove all unnecessary spaces inside that data cell.
Please understand that my initial response does not always resolve the issue immediately. However, you can try checking and let me know if it works for you. If not, we can work together to find a solution.
If you have any questions or need further assistance, please feel free to share them in the comments on this post so I can continue to support you.
Thank you for your understanding and cooperation. I'm looking forward to your reply.
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