Capcom has already officially acknowledged issues with the Arena Quest and Challenge Quest rankings in Monster Hunter Wilds, confirming that some posted times are either fraudulent or bug-related.
In a statement from the official ‘Monster Hunter Status’ X/Twitter, the team explained that “obviously abnormal times” will be removed from the leaderboards, and players found to have used cheats or external tools will be disqualified from receiving rewards.
As a result, some players may now encounter the error code EW_3671F when accessing the Arena Quest Counter. This message appears when your quest completion time fails to upload. If you receive this error, you should select the option to discard the unsent time, or else you will be unable to transmit future times.
Capcom has also clarified that rewards will only be distributed once the rankings are finalized, after any invalid times have been removed. Furthermore, accounts engaging in illegitimate activity may be suspended.
You can find full details about Arena and Time-based Competition Quests on the official Monster Hunter Wilds site.