enter image description hereAfter getting Access token, by sending GET request to
https://app.powerbi.com/groups/me/datasets/
by adding access
It appears you may be using the wrong endpoint. The documentation for the Rest API is here: https://docs.microsoft.com/en-us/rest/api/power-bi/datasets
To get a list of data sets you either need to use this endpoint (note there is no "group" designation in URL)
GET https://api.powerbi.com/v1.0/myorg/datasets
Or this one (which is data sets for a specific group -- group ID is required)
GET https://api.powerbi.com/v1.0/myorg/groups/{groupId}/datasets
You appear to be using the endpoint that returns groups. I think "/me/datasets" must be getting ignored
GET https://api.powerbi.com/v1.0/myorg/groups
Hope this helps