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TI-API: Access denied response from backlog API calls

I am able to authenticate with the API servers using my customer key and secret but all API calls afterward get an "Access denied" response.

Here is an example of a response when trying to create a test backlog order:

<HTML><HEAD>
<TITLE>Access Denied</TITLE>
</HEAD><BODY>
<H1>Access Denied</H1>
 
You don't have permission to access "http&#58;&#47;&#47;transact&#45;pre&#46;ti&#46;com&#47;v2&#47;backlog&#47;orders" on this server.<P>
Reference&#32;&#35;18&#46;e4272417&#46;1689206875&#46;5c1b5ac
</BODY>
</HTML>

I am using the key/secret specifically for the backlog API sandbox. I have a separate key and secret for the Orders API and can successfully create orders. Why are the servers responding with "Access Denied" and what do I need to do to get access?

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