@aryan_s1977 What you are encountering is the expected behavior in free edition. Databricks imposes a hard limit of 0 on premium, high demand Foundation Models especially - Claude and GPT groups when a workspace is operating under a free edition.
You can use llama 4 maverick or other Llama models without issues for now as they are exempt from this specific zero-rate-limit hold, so you can swap the endpoint configuration to the Maverick model. You can reach out to your Databricks account team for the upgrade as you are already on a paid workspace and seeing the error.