"Incorrect API key provided: error again"

Welcome to the community!

Where did you find this? one of the issues is probably the <>.

here’s what it’s supposed to look like

curl https://api.openai.com/v1/audio/speech \
  -H "Authorization: Bearer $OPENAI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "tts-1",
    "input": "The quick brown fox jumped over the lazy dog.",
    "voice": "alloy"
  }' \
  --output speech.mp3

here are the docs: https://platform.openai.com/docs/api-reference/audio/createSpeech

you may also (or not) run into issues with pay as you go. if you get a 429 error after fixing your request, check here: [March 8+] API Error 429...check plan or billing details = Monthly Billed Accounts Switched to Prepaid