The issue has been resolved by Azure

Between 01:37 UTC and 06:27 UTC on July 12, 2024, customers may have experienced failures while attempting to launch cluster and serverless compute resources.

https://status.azuredatabricks.net/pages/incident/5d49ec10226b9e13cb6a422e/6690a56f94f86533bf515691

The Australia East (AUE) region is impacted by an Azure Databricks issue preventing clusters to start. There is a databricks cluster running in AUE and a mitigation put in place so it doesn't go to sleep until we've confirmed the issue is resolved.