Ratings will start to display on your graph on the dashboard when you have completed 10+ clean time trial sessions (in F1 22, F1 2021 or F1 2020).
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If you are using Assetto Corsa then these 10+ sessions also have to be completed on track/car combinations that have had enough other drivers driving the combo. Therefore in order to see the ratings it would be advisable to first drive Kunos cars and tracks.
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Have patience your rating will appear soon 😀