Hello Marcus Fox,
Welcome to the Microsoft Q&A forum.
It seems like you don't have "Azure databricks account admin" access to the Azure databricks account portal.
There are two levels of admin privileges available on the Azure Databricks platform.
Account admins: Manage the Azure Databricks account, including enabling Unity Catalog, user provisioning, and account-level identity management.
Workspace admins: Manage workspace identities, access control, settings, and features for individual workspaces in the account.
Can you please confirm whether you have Account admin privileges using the Azure databricks account portal: https://accounts.azuredatabricks.net