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I am trying to use Named Credential for Marketing Cloud Transactional Messaging API. And I am having issues sending SMS.

I was able to setup an External Credential: Authentication Protocol = OAuth 2.0 Authentication Flow Type = Client Credentials with Client Secret Flow

And I was able to authenticate using the Client Id and Client Secret. Please see below:

NAMED_CREDENTIAL_REQUEST NamedCallout[Named Credential Id=xxxx, Named Credential Name=MCCredential, Endpoint=https://mcls-xxx.rest.marketingcloudapis.com/messaging/v1/sms/messages/xxx-xxx, Method=POST, External Credential Type=EXTERNAL, HTTP Header Authorization=Method: Bearer - Credential: xxx, Content-Type=application/json;charset=UTF-8, Request Size bytes=296, Retry on 401=True]

However, I could not send an SMS.

See that status is 404:

02:08:27:165 NAMED_CREDENTIAL_RESPONSE NamedCallout[Named Credential Id=xxx, Named Credential Name=MCCredential, Status Code=404, Content-Type=application/json; charset=UTF-8, Response Size bytes=134, Overall Callout Time ms=1137, Connect Time ms=1

I believe the access token received is not enough because I needed(not required) the account_id for the request as per documentation. https://developer.salesforce.com/docs/marketing/marketing-cloud/guide/access-token-s2s.html#access-token-return

Using Custom Setting to set the credentials with account_id is working fine.

callout request for accesstoken -> callout send sms using the accesstoken

I also tried removing the account_id with this approach and I got the same error. So I'm quite sure that this issue is caused by the missing account_id on the credential.

Is there a way to pass the account_id or somewhat override the authentication in the external credential? I want to use the named credential to avoid 2 callouts and to completely remove the custom setting.

Note: I don't have the visibility on the MC side and have no experience on MC. I probably need to reach out to them.

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  • When the client (MC calls it package) is created on MC side, it's done so in the context of the MC tenant and its underlying business units (organization/structure). Needing or not needing the account id is based on that. Talk to your MC admin. If the account id is needed, unfortunately you won't be able to use Named/Ext Cred to do oAuth because with account id the flow is not oAuth standard. (You can still use NC/EC to store credentials and use them in your Apex code)
    – identigral
    Commented Jul 10 at 20:33
  • 1
    I see, thanks! @identigral
    – Ryonin
    Commented Jul 10 at 21:07

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