This question is going to seem like a duplicate of all the previous ones around this issue, specifically this question PHP Instagram API - How to get MIN_TAG_ID and MAX_TAG_
Reread the sandbox documentation and caught this sentence.
But instead of returning media from any public Instagram user, it will return only media that belongs to your sandbox users, restricted to the last 20 for each user.
I needed to use a tag that I had posted before. Leaving the question for anyone else dealing with the issue.
Nothing is broken they are sending the message for all API calls, you can see the same result in apigee.com