Using a token to access items that have been shared with me

Anonymous User

I have an application which is using the REST API to query a webmap item that an organization had shared with "everyone". Recently, there was a requirement that the organization share the webmap internally only, and with specified groups. I have been added into one of those groups and can access the webmap via ArcGIS Online's UI. However, I am unable to use the REST API to access the webmap.

I created a new Application on developers.esri.com, and modified my code to generate a token 

Anonymous User

...continued due to being unable to post a full comment... using https://www.arcgis.com/sharing/rest/oauth2/token in order to make requests to secure items. The Client Secret and Client Id were both created using my credentials.

However, I am still unable to access the shared resource when using the token that has been generated. Is there any way to access these resources using my token?

Is it intended that I can't programmatically access items that have been shared with me, even with a token?