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Mike-9467 asked ·

Hotmail access via Graph API - Forbidden / Target resource hosted on database is currently on backend 'Unknown'


I am trying to access the emails from my personal Hotmail account via the Graph API.

I have registered an application in Azure and granted it the necessary permissions from Mail.x and User.x

I set the supported account type to 'Accounts in any organizational directory (Any Azure AD directory - Multitenant) and personal Microsoft accounts (e.g. Skype, Xbox)'

Minimal python script:

 tenant = 'xxx'
 app_id = 'xxx'
 app_password = 'xxx'
 userAccount = '{}'
 resource_URL =''
 authority_url = ''%(tenant)
 context = adal.AuthenticationContext(authority_url)
 token = context.acquire_token_with_client_credentials(resource_URL, app_id, app_password)
 request_headers = {'Authorization': 'bearer %s'%(token['accessToken'])}
 message_URL = '{}/messages'
 result = requests.get(message_URL, headers = request_headers)

It returns a 503 response and the message 'Target resource 'xxxxxxxx-xxxx-xxxx-0000-000000000000' hosted on database 'xxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxx' is currently on backend 'Unknown'. (Redacted)

The Graph Explorer works just fine. I believe the issue is with my configuration within Azure since I get the 503 status from a Javascript call too. I really don't know what I am missing though...

Thanks in advance

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Glad that you isolated the issue with Microsoft Graph Explorer.
Share the detailed error that you're getting with the requestid, timestamp and see which Graph API call it's failing.

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Thanks for the response. Can you please advise where I can obtain this information? Nothing else is returned in the request and I cannot see the relevant logs in Azure either.


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