This is due to Service Disruption (Started: September 29, 2020 00:04 UTC and Resolved: September 29, 2020 04:56 UTC) from Azure Databricks.
Here are the details from Status Notification from Azure Databricks Status Page:
One of the affected Infrastructure Component: Authentication
We are investigating an issue affecting user login.
- Users may observe intermittent or consistent log in failures.
- Users may notice increased latency in jobs/notebooks.
The Azure Databricks Status Page provides an overview of all core Azure Databricks services. You can easily view the status of a specific service by viewing the status page. Optionally, you can also subscribe to status updates on individual service components, which sends an alert whenever the status you are subscribed to changes.
Reference: Azure Databricks Status page