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Vapi AI

Hi Everyone, I've ran into a snag and need a second(or more) eyes to tell me what im doing wrong.
My sip trunk provider gave me the following
    SIP Authentication ID:888888
    SIP Password:5555555
    Server:hpbx026.XXXXXX.com
    Port:5060

This is the api call I made:
curl --location 'https://api.vapi.ai/credential' \
--header 'Content-Type: application/json' \
--header 'Authorization: Bearer XXXXXXXXX' \
--header 'Cookie: _cfuvid=a8llnlIQA9cCjTJV05wE1t0qkJihOrMc41Enf_24yrE-1753911541612-0.0.1.1-604800000' \
--data '{
    "provider": "byo-sip-trunk",
    "name": "TestTrunk",
    "gateways": [{
      "ip": "hpbx026.XXXXXXXXXX.com"
    }],
    "outboundLeadingPlusEnabled": false,
    "outboundAuthenticationPlan": {
      "authUsername": "888888",
      "authPassword": "5555555"
    }
  }'


Unfortunetly its not registering. Am I missing something?