REST API Endpoint Throwing 401 error on Create Issue

[sbbdev]

I am looking into an issue on one of our applications that uses the REST api to create a new issue as part of a project. We pass over a payload that consists of summary and description.

The JSON payload appears to be formatted correctly, but the response status code is 401.

Debug Logs:

14:31:00.1 (26726539)|SYSTEM_METHOD_ENTRY|[34]|System.Http.send(ANY)

14:31:00.1 (26778416)|CALLOUT_REQUEST|[34]|System.HttpRequest[Endpoint=https://mycompany.jira.com/rest/api/3/issue, Method=POST]

14:31:00.1 (679209449)|CALLOUT_RESPONSE|[34]|System.HttpResponse[Status=null, StatusCode=401]

{
"fields": {
"project": {
"id": "17074"
},
"summary": "Testing Submission - \"Please ignore\"",
"description": {
"type": "doc",
"version": 1,
"content": [
{
"type": "paragraph",
"content": [
{
"type": "text",
"text": "What is the problem that needs to be solved?\n* some\n* bullet\n** indented\n** bullets\n* points\n\n- different\n- bullet\n- types\n\nSome Text goes here.\n\n[Test1|http://yahoo.com]\n[Test2|https://www.google.com]\n\nWho is going to be using this?\nwh\nAdditional information:\nad\n"
}
]
}
]
},
"issuetype": {
"name": "Task"
},
"reporter": {
"name": "someusername"
}
}
}

Is there something in my summary text that is breaking this submission that isn't escaped correctly?

[DPKJ]

Response 401 implies authentication issue.

Also if you are building App have you checked that you have "WRITE" scope.