How to FIND the source of 'DataFormat.Error: Invalid cell value '#NAME?'.'

Hi Netrelemo 
You can apply those steps :

1. From the view tab check on the option "Column quality"

2. If you have more than 1000 rows, you can test all of them if you change the default option:

Just click on the bottom left inscription and choose "column profiling based on all data set"

3. On hovering the mouse cursor on the place of statistics of quality m select the option of keep errors:

In this way you will stay with your problematic rows and their details :

You can also refer to the Microsoft documentation about the issue :
https://learn.microsoft.com/en-us/power-query/dealing-with-errors

from the part :

Handling errors at the cell level

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Netrelemo 
They appear on some steps, you just need to go over all the steps that are recorded and wait until the step updates itself (a few seconds).

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