Quick answer
What you need to know
No redeem code string is confirmed by the current evidence pack. Group and daily rewards exist, but they are not promo codes.
Current status
There are no confirmed working or expired code strings in the supplied screenshots, recent videos or checked official listing.
Rewards are not codes
Daily and group rewards can grant currency without a typed code. Keeping these systems separate prevents misleading code lists.
How this page updates
A code will be listed only after its exact string, reward and check date can be recorded in the live game.