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Thanks for your comment, maybe I did not clarify enough: The version without starting values works for me, however, the one that includes "start" does not. Did you test the last line of code?
I have an issue with the handling of TimeSeries, which is best described by the following MWE: data = Import["https://pastebin.com/raw/Xj6x3PSe"]; dates = Table[DateList[{StringTake[data[[k, 1]], 10], {"Day", "Month","Year"}}], {k, 2,...