Hi there, we can confirm that this issues have now been resolved. Please manually close and reopen your game before playing. You will now be able to earn Trophies as normal in Elite Showdown and complete any Showdown Race Pass Task. 

We sincerely apologize for any inconvenience this has caused and thanks again for your patience and understanding. 

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Our team is aware there are multiple issues with Elite Showdown which include:

Trophy count reset 
Showdown Race Pass Task not completing 

We apologize for any inconvenience this may cause. Be assured that are we are working quickly to resolve this issue. 

Thank you for your patience and understanding.