403 on POST issue creation in browser but works in postman

[Ash]

Getting a 403 when running the same exact request I am running in Postman in the browser. Its not my credentials, because my other requests are working fine (all GET requests) and my user has permission to create issues. I don't understand why the same exact request would work in postman... but not on localhost within my dev environment.

https://api.atlassian.com/ex/jira/418b1b61-99b2-4e3f-8c27-33f47fac0226/rest/api/3/issue
Accept: application/json
Authorization: Basic ---encoded creds---
Body: {    "fields": {        "project": {            "id": 10097        },        "summary": "Test - Please ignore",        "issuetype": {            "name": "Task"        },        "customfield_10018": 127,        "customfield_10086": 2,        "labels": ["Design"]    }}

Like I said, 201 created in postman and 403 when running from my browser.

[Deleted user]

Can you please advice what web browser are you using and what REST API tool in that browser?

You said you were running Postman 'in the browser', but Postman is a stand-alone application that doesn't run 'in' a browser.