I'm attempting to access a Child Business Unit using an Installed Package created in the Parent Business Unit. I am POSTing this payload {   grant_type: 'client_credentials',   client_id: {{ Parent Business Unit client_id }},   client_secret: {{ Parent Business Unit client_secret }},   account_id: {{ Child Business Unit MID }} }  to https://&lt;yourSubdomain&gt;.auth.marketingcloudapis.com/v2/token The error message I'm getting back from the API is {   &quot;error&quot;: &quot;invalid_client&quot;,   &quot;error_description&quot;: &quot;Client authentication failed. Make sure that the client ID and client secret are valid and that the package is installed and enabled.&quot;,   &quot;error_uri&quot;: &quot;https://developer.salesforce.com/docs&quot; }  I know that the credentials are working because I can successfully get an access token for the Parent BU. I reviewed the post here  and the accepted answer doesn't solve the issue. Is there something I'm missing in the docs about how to access the Child BU?
We have our main BU (business unit) at the top of the tree, and one of the other BUs is TEST. In TEST we have created an Installed Package and in that installed package we have added a Server-to-Server API Integration. In the Access tab of that API Integration we've disabled the integration for the Parent BU, and have enabled it for the TEST BU.  When we make Rest API calls to the endpoint created in that API Integration we always get data from the "Main" BU, and not from the TEST BU.  If I create a contact that is available in both the Parent and TEST BU, but if I try to trigger an email based on a Triggered Send definition only the definitions created in the Parent BU are available and not the definitions from the TEST BU.  How can I access the data in the TEST BU from the Rest API? And why aren't the permissions preventing me from taking actions on the Parent BU?
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