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And if that won't help you may need to follow steps in sections to fix error, maybe on both platforms https://www.epicgames.com/help/en-US/c-Category_RocketLeague/c-RocketLeague_Gameplay/how-do-i-sync-my-clock-to-fix-save-or-load-failures-in-rocket-league-a000086219
Also DLCs purchased on Switch for real money before free to play update are not shared (Nintendo didn't allow that) https://www.epicgames.com/help/en-US/c-Category_RocketLeague/c-RocketLeague_Gameplay/can-i-use-my-rocket-league-dlc-items-on-all-platforms-a000084449