SharePoint to Power BI connection error - "THE KEY DIDNT MATCH ANY ROWS"

Hi @Curious_Money ,
I hope your issue was resolved.
If you are still facing the issue, you can follow these steps to resolve-

1. Check “First Row as Header” Step

= Table.PromoteHeaders(PreviousStep)

Then when you replaced the file, if the first row is now already headers, Power BI will still try to promote that row, turning your actual headers into data. This often breaks the schema expected in the next step.

In Power Query Editor:

Find the step called Promote Headers or something similar.

If your new Excel already has headers, delete or skip this step.

Check the step after Promote Headers for errors. If you see column reference issues like #"Changed Type" failing, fix them based on the new header structure.

2. Check the Excel Sheet Navigation Step
Power BI uses a step like this to locate a sheet or table

= Source{[Item="Sheet1",Kind="Sheet"]}[Data]

If the Excel file structure internally changed (like from a table to a sheet, or vice versa), even with the same name, this step will fail.

Go back to Power Query Editor > Advanced Editor.

Look for something like:

Source = Excel.Workbook(Web.Contents("...")),
Navigation = Source{[Item="Sheet1",Kind="Sheet"]}[Data],
Ensure the Kind is matching (e.g., "Sheet" vs "Table").

If needed, use the Navigator pane to re-select the correct sheet/table.

3. Check for Column Rename / Type Change Errors
Even though column names are the same, Power BI is very sensitive to case and whitespace (e.g., Sales ≠ sales).

In Power Query, go to the Changed Type step or any step that refers to specific column names.

If any column is missing, the step will break. Double-check spelling and order.

Re-map or remove problematic steps.

4. Test with a Clean Import
If the issue still isn't fixed, try this:

Open Power BI Desktop.

Go to Home > Get Data > SharePoint Folder.

Re-import the updated file.

Compare the steps with your original query.

This helps isolate whether it's the file or the steps causing the issue.
Hope this helps!
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Thank You