I posted to Mi Yodeya Meta 4 hours ago, and did not receive the badge on that site.
Are there any hidden requirements for the badge (post a positively-scored answer?) that I need to fulfill?
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most hats that require creating content, especially questions and answers, have some requirements that may not be mentioned in the hat description. Generally this involves questions/answers having a positive score (i.e. getting at least one upvote), not being closed/deleted, etc.
Your answer has a score of -1 right now.