Received a response from Microsoft, it is because using the wrong Excel connector. Need to use Excel Online (Business) connector.
Thanks a lot: works flawlessly!
But why did it took so long to receive the correct answer?
I am still seeing the problem, though it may be due to multiple flows interacting with the Excel sheet as well as multiple users from different computers using it through the day. It is disappointing that there are this many issues with such an integral part of the Microsoft Office package.
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