trying to get access token from graph api to be able to send mail from app.

Question

when trying to get the access token so that I can call graph mail.send, I am getting a 400 bad request.

below is the rest api I am calling:

https://login.microsoftonline.com/{tenant}/oauth2/v2.0/token?client_id={app id}&scope={have tried pointing to graph and the api:appid}&client_secret={tried value and secret id}&grant_type=client_credentials

no matter what I try I get a 400 error...

Have been going round and round with this trying to get the app to work, need to be able to send custom emails.

Thanks up front for any assistance.

Regards,

Pat

Answer 1

Hi @Pat Sinclair

Don't try to put the app ID in the scope, this token should only be used to call the graph API and not other web APIs.

Also, this is a POST request instead of a GET request, don't try to request the URL in the browser, you can send the token request in an API client tool such as Postman.

POST https://login.microsoftonline.com/{tenant id}/oauth2/v2.0/token           
Content-Type: application/x-www-form-urlencoded

client_id={client id}
&scope=https://graph.microsoft.com/.default
&client_secret={client secret}
&grant_type=client_credentials

Hope this helps.

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Answer 2

You can use tools like Postman or cURL to test your token request outside of your application, which can help isolate the issue.