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Unauthorized error/401 on calling Odata service using Bearer token(Client Credentials)

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Posted on by N.Mahadani

Hi Community members,

I used the below code block in C# to create a bearer token:

ClientCredential clientCredential = new ClientCredential(AADClientID, AADClientSecretKey);
AuthenticationContext authContext = new AuthenticationContext(AADTenant);
AuthenticationResult result = authContext.AcquireTokenAsync(D365Url, clientCredential).Result;
string authHeader = result.CreateAuthorizationHeader();
Console.WriteLine(authHeader);
Console.ReadLine();

This code was used earlier to create authentication tokens and then this token was used to call odata services like data/GetTermsList using Postman.

Earlier I used to get data but now I am getting status code 401 unauthorized.

I have created the Dynamics 365 Finance VM from Lifecycle Services.

Then I have also created Azure Active Directory Application under Setup on the System Admin module of the Dynamics 365 Finance portal.

Can anyone share if anything has changed in between last 2-3 months?

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nmaenpaa 101,160 Moderator on at

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Has something changed on your end in the last 2-3 months? For example have you deployed a new system and it's not working in this new system?

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N.Mahadani 5 on at

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Yes. Our old environment's subscription got expired 3 months back. So we created a new set of subscription, AAD tenant, Dynamics 365 Finance VM. We deployed our AX model project in this VM. We are able to see the data when we hit the browser(with /data/GetTermsList etc.). When we are using ClientCredential grant flow, we are getting a token using which the odata calls are not getting through(401).

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nmaenpaa 101,160 Moderator on at

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Ok, so most likely something on your side is set differently than before.

The authentication flow hasn't changed recently.

Did you remember to create an AAD app registration in your new AAD tenant? And add the D365FO URL in the redirect URL list for that AAD app registration?

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N.Mahadani 5 on at

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We found out the real issue. The issue was occurring due to a trailing slash '/' in the D365Url variable. This created a bearer token, but the token when used for a resource call, it returned 401. When we removed the trailing '/', it worked well.

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nmaenpaa 101,160 Moderator on at

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Ah, that's the good old trailing dash

Nice that you found it. But this also means that you were making two different request in these two D365 systems, right? One request with a trailing dash and another one without.

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N.Mahadani 5 on at

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Yes. Actually the resource call requires the structure to be

<Dynamics_VM_aos.dynamics.com>/data/GetPaymentTerms. So a slash after dynamics.com is obvious and inevitable over here.

The token call was using a url with trailing slash and that was going wrong. Instead now we used the token call without the trailing slash( like <Dynamics_VM_aos.dynamics.com>) and it worked like a charm.

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