Hi @cftj-0519 ,
Welcome to Microsoft Q&A forum and thanks for reaching out here.
From the error message it seems your Service Principal or the user account trying to access the Catalog doesn't have necessary permissions.
Please ensure that the user account has below permissions.
Data curators can perform create, read, modify, and delete actions on catalog data objects and establish relationships between objects.
I just tried to get the business asset definition using this API and was able to get the details without any issue
Hope this helps. In case if you are still having the issue, kindly share a picture of the user account with assigned currently assigned permissions.
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