Jira REST API v3 with OAuth 2.0 (3LO) returns 401 Unauthorized

[Hiroshi Nishio]

Summary

I used Postman to check if the Jira Platform REST API v3 with OAuth 2.0 (3LO) works BUT received this error... 401: Unauthorized.

Configuration

• Status Code = 401: Unauthorized
• Endpoint = https://api.atlassian.com/ex/jira/0a94f......ff1ee2/rest/api/3/project/search?maxResults=50&startAt=0
• Required scope: read:jira-work

• Authentication method = Bear Token
• Access Token = eyJhbGciOiJIUzI1N.......... .eNPQT1AkZt5Ftqtod8
• Registered scope = offline_access read:jira-user read:jira-work read:me read:account

Return from Postman

{

    "code": 401,

    "message": "Unauthorized"

}

Reference

• OAuth 2.0 (3LO): https://developer.atlassian.com/cloud/jira/platform/oauth-2-3lo-apps/
• Jira Platform REST API v3: https://developer.atlassian.com/cloud/jira/platform/rest/v3/api-group-projects/#api-rest-api-3-project-search-get

[Hiroshi Nishio · Accepted solution]

Resolved.

It was an ordinary mistake. I was using an access token that was issued over an hour ago (3600 seconds) and had simply expired. However, the error message was simply 401 and I did not notice...