Unable to get token form postman - returns 404

@NormKelson-5136, I believe the redirect_url parameter is not needed here as per the doc: https://learn.microsoft.com/en-us/azure/active-directory/develop/v2-oauth2-client-creds-grant-flow#first-case-access-token-request-with-a-shared-secret

I tried the same and it worked for me. Please refer to the screenshot below:

Hope this helps.

Do let us know if this helps and if there are any more queries around this, please do let us know so that we can help you further. Also, please do not forget to accept the response as Answer; if the above response helped in answering your query.

Hello @NormKelson-5136

With the URL and the parameters that you have specified in your request, you should not get 404. There can be a problem connecting to internet via Postman. If you try to make a get call to any other website via postman, do you get 200 OK response?

If you are using Proxy to connect to internet, make sure correct proxy address and credentials (if required to connect to proxy) are specified in postman settings. If you are running any application that captures network traffic like fiddler, wireshark etc., try to close those applications and make the call via Postman. I have seen Postman failing to connect to internet when fiddler is running.

Please do not forget to "Accept the answer" wherever the information provided helps you. This will help others in the community as well.

Try doing it from powershell. Just set proper client secret value (xxx):

$headers = New-Object "System.Collections.Generic.Dictionary[[String],[String]]"
$headers.Add("Content-Type", "application/x-www-form-urlencoded")

$body = "client_id=96cf93dd-5c8b-41b9-a94d-aaf08e166fa5&scope=.default&redirect_url=https%3A//login.microsoftonline.com/common/oauth2/nativeclient&grant_type=client_credentials&client_secret=xxx"

$response = Invoke-RestMethod 'https://login.microsoftonline.com/4e54a1c8-d98b-4f9b-8de9-bad93ae00fba/oauth2/v2.0/token' -Method 'POST' -Headers $headers -Body $body
$response | ConvertTo-Json

Or bash:
wget --no-check-certificate --quiet \ --method POST \ --timeout=0 \ --header 'Content-Type: application/x-www-form-urlencoded' \ --header 'Cookie: buid=AQABAAEAAAAGV_bv21oQQ4ROqh0_1-tAASGdPbwjf8YEceRnN-BDOOM98nhwtQNP_1EU1zLTR5bdgk3ZrFyIXRVyrhSLWAZe9MY5_YIgwlwlj5wIx4v2maZBaseUA0H5Na0T5JWNUkEgAA; x-ms-gateway-slice=prod; \ --body-data 'client_id=96cf93dd-5c8b-41b9-a94d-aaf08e166fa5&scope=.default&redirect_url=https%3A%2F%2Flogin.microsoftonline.com%2Fcommon%2Foauth2%2Fnativeclient&grant_type=client_credentials&client_secret=xxx' \ 'https://login.microsoftonline.com/4e54a1c8-d98b-4f9b-8de9-bad93ae00fba/oauth2/v2.0/token

I copied your powershell suggestion below. I've removed the client_secret from below. There was a syntax error. I'm not familiar with this code but the error seems to be at the beginning:

PS C:\Users\norm.CPEI> $headers = New-Object "System.Collections.Generic.Dictionary[[String],[String]]" $headers.Add("Content-Type", "application/x-www-form-urlencoded") $headers.Add("Cookie", "buid=AQABAAEAAAAGV_bv21oQQ4ROqh0_1-tAASGdPbwjf8YEceRnN-BDOOM98nhwtQNP_1EU1zLTR5bdgk3ZrFyIXRVyrhSLWAZe9MY5_YIgwlwlj5wIx4v2maZBaseUA0H5Na0T5JWNUkEgAA; x-ms-gateway-slice=prod; stsservicecookie=ests; fpc=AoMfMhLDAA1AlPY3FfU6OZLx3TTpBQAAABrqltYOAAAA") $body = "client_id=96cf93dd-5c8b-41b9-a94d-aaf08e166fa5&scope=.default&redirect_url=https%3A//login.microsoftonline.com/common/oauth2/nativeclient&grant_type=client_credentials&client_secret={..} $response = Invoke-RestMethod 'https://login.microsoftonline.com/4e54a1c8-d98b-4f9b-8de9-bad93ae00fba/oauth2/v2.0/token' -Method 'POST' -Headers $headers -Body $body $response | ConvertTo-Json

You cannot call a method on a null-valued expression.
At line:1 char:1

• $headers = New-Object "System.Collections.Generic.Dictionary[[String] ...
• ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
• CategoryInfo : InvalidOperation: (:) [], RuntimeException
• FullyQualifiedErrorId : InvokeMethodOnNull

PS C:\Users\norm.CPEI>