Encounter a **401 Unauthorized** error due to a scope mismatch for Subtask creation from API

Hi
I am utilizing an [OAuth 2.0 (3LO) app] that created in developer console to perform actions on [digital-bcg-sandbox-156.atlassian.net] instance from ChatGPT.

This app has the "write:jira-work " scope, allowing to create Jira issues in the CTBA project.
However, when attempting to create a subtask, I encounter a 401 Unauthorized error due to a scope mismatch.

We have verified that ChatGPT is using the [Create issue REST API]#api-rest-api-3-issue-post) for this action, and the classic "write:jira-work " scope should suffice.
We also confirmed that the payload is correct, but the request isn’t reaching the Jira application because scope validation occurs at the edge.
Please help