chart_fill_colors is a config option that applies to all lines/bars not 
individual lines/bars. Try moving chart_fill_colors to be under the main 
plot config rather than under an individual line/bar config, eg:

#Histogrammes horaires électricité LINKY
        [[[daylinky1]]]
            yscale = None, None, 1
            plot_type = bar
            unit = watt_hour
            chart_fill_colors = Red
            [[[[electricityLinky]]]]
                color = Red
                aggregate_type = sum
                aggregate_interval = hour
                label = Linky (total horaire)

If you want to specify the colour for an individual bar use fill_color 
instead, eg:

#Histogrammes horaires électricité LINKY
        [[[daylinky1]]]
            yscale = None, None, 1
            plot_type = bar
            unit = watt_hour
            [[[[electricityLinky]]]]
                color = Red
                fill_color = Red
                aggregate_type = sum
                aggregate_interval = hour
                label = Linky (total horaire)

Gary

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