Cannot access IAM or enable APIs on auto-provisioned Gemini Enterprise project

A project was auto-provisioned by my Gemini Enterprise subscription. I need to deploy a Vertex AI Agent Engine (Reasoning Engine) into it so I can register it as an agent in Gemini Enterprise. However, I cannot access the IAM page, enable APIs, or manage any permissions on this project despite being the Google Workspace admin 1. I get “You need additional access” when visiting IAM, and “Missing required permission serviceusage.services.enable” when trying to enable the Vertex AI API. gcloud commands also return PERMISSION_DENIED. I don’t have a support plan so not sure how I can get this sorted?