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First, thank you for your quick reply.
I had indeed not formatted the cells as text, nor was the excel in the same working directory. However, I have now further a problem and come unfortunately not at all further.

Test Excel:

maxbaumann07_0-1693418864451.png


Error:

maxbaumann07_1-1693418892692.png

 

maxbaumann07_2-1693418911290.png