Hello,
Thanks for contacting Databricks Support.
It appears you're employing a CloudFormation template to establish a Databricks workspace. The recommended method for creating workspaces is through the AWS Quick Start. Please refer to the documentation:https://docs.databricks.com/en/administration-guide/workspace/quick-start.html
and proceed with the setup.
If you enabled AWS CloudWatch, please check the logs for more detail information.
Regards,
Monica