I'm trying to access the new Android Management API for our organization but I run into problems accessing the API. Everything runs fine when accessing the API through the API explorer. To run this on our server, I have created a new project in the Google cloud console and created a service account there. I downloaded the key and use this for local testing on my machine. However, upon the first signupUrl call, I get a 403 error, stating: "Caller is not authorized to manage project.". The service account I'm using has the "Project Owner" role, I don't see how I can give it even more privileges...
The code I'm using:
def initial_enterprise_user(request):
    enterprise_token = request.GET.get('enterpriseToken')
    usr = request.user
    scopes = ['https://www.googleapis.com/auth/androidmanagement']
    credentials = ServiceAccountCredentials.from_json_keyfile_name(settings.SERVICE_ACCOUNT, scopes=scopes)
    if enterprise_token is None:
        androidmanagement = build('androidmanagement', 'v1', credentials=credentials)
        resp = androidmanagement.signupUrls().create(projectId=settings.ANDROID_MGMT_PROJECTID).execute()
        if resp.status_code == 200:
            usr.signup_url_name = resp.json()['name']
            usr.save()
            return render(request, 'initial_login.html', {'response_url': resp.json()['url']})
        else:
            return HttpResponse('Failed to get signup url')
    else:
        # handle token present
 
    