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According to AMD Support on all the games that support Fidelity FSR 1, FSR 2, & FSR 3 under "FSR 3" it does show your game as being supported: https://www.amd.com/en/products/graphics/technologies/fidelityfx/supported-games.html#tabs-ab87f43a0...
Here are the Hardware requirements for Fidelity FSR 3:
For the RX 550 it only supports Fidelity FSR 3 for UPSCALING.
Do you have Fidelity FX enabled in Farming Simulator 22?