Gpt-4o-mini and others work, but o3-mini does not

I am using the exact same endpoints and exact same messages. Why would o3-mini not work?
Does the message structure need to change? Does the api endpoint (v1/chat/completions) need to change? What’s up??? Like I said. It works fine with gpt-4o-mini, deepseek-chat, deepseek-reasoner, grok/ x. ai, nvidia, etc… Why would o3-mini fail to produce a response?

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