Our team is aware that the daily gift open limit has reverted to 10 Gifts per day and is working on a fix. We appreciate your patience while we work to resolve the issue.
Resolved at 3pm PT
Fyi, this seems to be happening for players where the Marauders event has started!
Update: We've released a fix that increases the daily gift open limit from 10 per day to 20 per day. Restart the app if the gift open limit hasn't updated.