VS code with Atlassian MCP Server - error creating issue with custom field

[Queenie Ng]

I am new to Agent + MCP, and was stuck in asking VS copilot Agent to create a Jira Test Issue Type with this error message:

 "message": "Failed to create issue: Bad Request. {\"errorMessages\":[],\"errors\":{\"customfield_12345\":\"must NOT have additional properties\"}}"

I asked the Agent, I google and search the jira api https://developer.atlassian.com/server/jira/platform/jira-rest-api-examples/

I tried lots of different input format for the custom field (Select list single option) but all of them fails - 

e.g.

 "customFields": {

    "customfield_12345": {

      "value": "my value"

    }

  }

or

"customfield_12345": { "value": "red" }

or

"customfield_12345": { "id": "11223" }

or

"customfield_12345": {

    "id": "11223",

    "value": "my value"

  }

Wondering if anyone has same issue and if it was resolved, how?  Or it's just a limitation of beta?

Thanks alot!