I have a GCP Databricks account on the Enterprise plan with GCP Marketplace configured as the default payment method. Partner-powered AI features are enabled, and we enabled the Supervisor API Beta preview. Unity Catalog v3 model services are visible under system.ai, but calls to system.ai.gpt-5-6-sol and system.ai.claude-sonnet-5 fail with PERMISSION_DENIED: The endpoint is temporarily disabled due to a Databricks-set rate limit of 0. Could you confirm why the account has a Databricks-set zero rate limit for these hosted models and whether it can be enabled?