If you get the This Workbook contains links to one or more external sources that could be unsafe warning prompt when opening an Excel file, use the below solutions to fix the error: Check external ...

The first thing to do here is to open your file within Excel. If the app is already opened, simply go to File > Open. Alternatively, you can locate the Excel file from File Explorer, then right-click, ...

In the company’s Microsoft 365 admin center message, it explained that the default behaviour on Excel will now prevent it from adding such references, and recommends users to stick to this setting.