REST API Permissions issue for Admin part of API

I'm using the Power BI Python library by Alex Reed (areed1192/power-bi-python-api: The Unofficial Python API wrapper for the Microsoft Power BI REST API. (github.com)). I added my own portion for the Admin part of the REST API. It currently only has the Get Reports as Admin function in it.

I got that part working. But, I appear to be having a permissions issue. The response I'm getting back is a 401. The logging feature in Mr. Reed's library is reporting this:

2021-11-22 16:29:55,812|session.py|URL: https://api.powerbi.com/v1.0/myorg/admin/reports
2021-11-22 16:29:56,163|session.py|{
    "error_code": 401,
    "response_url": "https://api.powerbi.com/v1.0/myorg/admin/reports",
    "response_body": "",
    "response_request": {
        "Authorization": "Bearer XXXXXXX",
        "Content-Type": "application/json",
        "Content-Length": "2"
    },
    "response_method": "GET"
}

The permissions for my app are here:

Can anybody think of what else I need to check? I feel like I'm so close.

Thank you for your help.