Groups have an (already unique) ID. Players join groups by that ID.
Group's name also being unique is redundant.
Similar to player display names - a non-unique group names feature should be made available to choose:
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Add 'UpdateEmailAddress' to API -- Currently you have to do this manually
PlayFab validation for rewarded adverts
Allow generate coupon via API (for example, gifting)
Make items more intuitive in terms of accessing certain elements
Optional longer coupon codes when used as a "game key"
Game Key Management - A RedeemCoupon extension + mgmt console