Finance | Project Operations, Human Resources, ...

Connection from postman to D365 fails - 401 unauthorized error

(1) Share

Report

Posted on by Monikasree GM

Team,
I am trying to call a D365 FO WEB API from Postman and getting '401 unauthorized' error.

Steps 1:
Note: I have used Bearer token option, API permissions are granted on App registeration, I am trying to connect Tier 1 development server
URL used to retrieve token: https://login.microsoftonline.com/TenantId/oauth2/token
Body of request:
client_id        - Azure App client id
grant_type    - client_credentials
resource       - D365 URL (Without slash at end)
client_secret - App secret

After sending the above HTTP request, I received a token

Step 2:

Also on the environment event viewer, this was the exact error message.

/'Can read the token but failed validating token with exception 'The token issuer https://sts.windows.net/tenantid/ is not valid, only the following issuers are allowed: (Listed some other tenants where my app and server not hosted)//

Please let me know what I am missing

I have the same question (0)

All responses (3)

Answers (0)

Layan Jwei 8,118 Super User 2025 Season 2 on at

Like (0)

Report

Hi Monikasree,

How did you define the tenantId when you got the token?
the URL should contain /:tenant_id/ and then define it's value in Params

it should be sth like this:

let me know if it works with you.

Thanks,
Layan Jweihan

Was this reply helpful? Yes No
Monikasree GM 41 on at

Like (1)

Report

Hello Layan Jwei ,

For security reasons I have not mentioned the exact tenantid in the previous image.

I have used the URL with Azure App tenant id and defined the same in the body as well.

Was this reply helpful? Yes No
Suggested answer

Layan Jwei 8,118 Super User 2025 Season 2 on at

Like (0)

Report

Hi Monikasree,

As I mentioned in the previous reply, the tenant_id shouldn't be defined in the body. You should define it's value in Params

Did it work with you at the end?

Thanks,
Layan Jweihan

Was this reply helpful? Yes No