How to interact w/Microsoft Graph API using ADAL.NET and v1 - microsoft-graph-api

Question

I've successfully written an API that can access a downstream API (using v1 ADAL.NET), so, I have some codes for that.. (the clients were based on AutoRest)
Furthermore, I've successfully gotten a sample Microsoft Graph web app running (but, it's coded for v2 and MSAL)
Does anyone have an example of an API accessing a downstream API (i.e. Microsoft Graph). While I can successfully get my access token, when I go to make the call I only get a Microsoft.Graph.ServiceException:
InvalidAuthenticationToken
Message: Access token validation failure.
Sample access token:
Header:
{
"alg": "RS256",
"typ": "JWT",
"x5t": "[removed]",
"kid": "[removed]"
}
Payload:
{
"aud": "https://graph.windows.net",
"iss": "https://sts.windows.net/[removed]/",
"iat": "1533754778",
"nbf": "1533754778",
"exp": "1533758925",
"acr": "1",
"aio": "[removed]",
"amr": "wia",
"appid": "[removed]",
"appidacr": "1",
"e_exp": "263047",
"family_name": "My Last Name",
"given_name": "My Name",
"ipaddr": "[removed]",
"name": "My Name My Last Name",
"oid": "[removed]-7593-4755-1234-bbbb1234aaaa",
"onprem_sid": "[removed]",
"puid": "[removed]",
"scp": "Directory.Read.All Mail.Send User.Read",
"sub": "[removed]",
"tenant_region_scope": "NA",
"tid": "[removed]",
"unique_name": "me#[removed].com",
"upn": "me#[removed].com",
"uti": "[removed]",
"ver": "1.0"
}
--- UPDATE ---
Maybe this is it? Downloading...
--- SOLVED ---
I was using the wrong resource uri. See my answer below for details

Answer 1

OK, the key things I've learned about interacting with Microsoft Graph API:
Yes, you CAN use the new client api NuGet from here with v1 and v2 app registrations
An example of the GraphServiceClient client in use is found at this QuickStart but it goes against v2 using MSAL
Borrow code from this sample project to do v1 (ADAL.NET) interactions with traditional app registrations in the portal
Where I went wrong: somewhere along the way, I thought the resourceUri I was supposed to use was https://graph.windows.net, but it's really just: https://graph.microsoft.com