Accessing Board config through REST API

[Gwenno Haf Hughes]

Hello,

I'm using the API Connector Add-On for Google Sheets in an attempt to access my Jira information.

I've set up the add-on successfully, and this GET request for example returns what I expect:

https://myDomain.atlassian.net/rest/api/3/dashboard

However, when I try to execute this GET request:

https://myDomain.atlassian.net/rest/agile/1.0/board/{boardID}/configuration

 it fails with:

{"errorMessages":["OAuth 2.0 is not enabled for this method."]}

I've verified that the board DOES exists, and that I DO have access to it, as when I try the same request through Postman it executes as expected.

Why am I then experiencing a failure with accessing the board config?

Thanks in advanced