I booked an TGVAir train+plane ticket with Air France, must I travel the first (train) leg?

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I have a booked TGVAir train+plane ticket with Air France. The problem now is that SNCF, the company that will effectively be handling my train journey, announced a train strike on my departure date. Therefore I am now looking to find other means of transportation to the airport (CDG) so that I don't miss the flight part of the journey.
Am I obliged to travel on the train part of the journey? Will my plane ticket be cancelled if I don't?
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inOui TGV High Speed Train: Air France Air \u0026 Rail ticket 1st Class Paris CDG Airport to Strasbourg
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Images: SAM MAJID, Renan Bomtempo, Samson Katt, Samson Katt