Update of generic user field ("Author")

[Thermi2000]

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Hi,

just tried to update user fields with a string value. 'Surname, Prename' format worked for a custom sharepoint person/group column, however, for the generic 'Author' column it does not work. No exception is thrown but there is no update visible in the sharepoint list. As I know from another sharepoint package from common RPA software that it is technically possible to update this field, maybe there is just something specialty to follow when dealing with this generic column? Using the '#ID;Surname, Prename' format does not work either.

Thanks and regards!