HighLevel oAuth2: ERROR: Unable to sign without access token

Questions
,
3

@Jon Thanks for reply, I’m missing about docs Access Token URL. I’ve tried connect like you guide with new parameter in Setting and successfully, too. But when call API, I get a another error
“ERROR: Unprocessable Entity”

Time
12/1/2023, 12:01:24 AM
Item Index: 0
HTTP Code
rejected
Cause
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{
"status": 
"rejected",
"reason": 
{
"body": 
{
"statusCode": 
422,
"message": 
[...], // 4 items
"error": 
"Unprocessable Entity",
"traceId": 
"aa78ee90-7633-43d8-9871-8b211a878dcb"
},
"code": 
"EAUTH"
}
}
Stack
NodeApiError: Unprocessable Entity
    at Object.execute (/usr/local/lib/node_modules/n8n/node_modules/n8n-nodes-base/dist/nodes/HttpRequest/V3/HttpRequestV3.node.js:1548:27)
    at processTicksAndRejections (node:internal/process/task_queues:95:5)
    at Workflow.runNode (/usr/local/lib/node_modules/n8n/node_modules/n8n-workflow/dist/Workflow.js:670:19)
    at /usr/local/lib/node_modules/n8n/node

===
P/s: Hi @Jon I’m follow above error and I find out I need to add more some parameter in Header and it’s working. Your guide is solution, thanks you very much!

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