Hello,

My Databricks-hosted Foundation Model endpoints appear READY, but every runtime invocation is blocked by a workspace-level quota.

Workspace details:
- Workspace ID: 7474647458172567
- Workspace URL: https://dbc-731cb41b-741e.cloud.databricks.com
- Region: us-west-2
- Serverless compute: enabled

Reproduction:
1. GET /api/2.0/serving-endpoints/databricks-claude-sonnet-5 returns HTTP 200.
2. Endpoint state is READY and config_update is NOT_UPDATING.
3. POST /serving-endpoints/databricks-claude-sonnet-5/invocations returns HTTP 403:
PERMISSION_DENIED: The endpoint is temporarily disabled due to a Databricks-set rate limit of 0.

The same workspace-level rate-limit error has also affected other Databricks-hosted foundation models, so this does not appear to be a missing endpoint or Model Service configuration issue.

Billing has been upgraded from the trial flow and a payment method is present. Partner-powered AI features are enabled. Creating another Model Service does not resolve the problem.

Could a Databricks community engineer please clarify:
1. How can an individual pay-as-you-go workspace receive a non-zero Foundation Model API rate limit?
2. Does the workspace/account need a manual entitlement or verification-tier update?
3. Which billing or account team can remove the Databricks-set rate limit of 0 if standard support is unavailable?

Thank you.