How do I configure access to Azure storage for both Databricks and Synapse using OAuth 2.0 authentication with a service principal?
To configure access to Azure storage for both Databricks and Synapse using OAuth 2.0 authentication with a service principal, you can follow these steps:

1. Create an Azure Data Lake Storage Gen2 account and a file system within it.
2. Create a service principal in Azure Active Directory and grant it the required permissions to access the Azure Data Lake Storage Gen2 account.
3. Configure the Databricks cluster to use the service principal for authentication by setting the following Spark properties:
```python
spark.conf.set("fs.azure.account.auth.type.<storage-account-name>.dfs.core.windows.net", "OAuth")
spark.conf.set("fs.azure.account.oauth.provider.type.<storage-account-name>.dfs.core.windows.net", "org.apache.hadoop.fs.azurebfs.oauth2.ClientCredsTokenProvider")
spark.conf.set("fs.azure.account.oauth2.client.id.<storage-account-name>.dfs.core.windows.net", "<service-principal-id>")
spark.conf.set("fs.azure.account.oauth2.client.secret.<storage-account-name>.dfs.core.windows.net", "<service-principal-secret>")
spark.conf.set("fs.azure.account.oauth2.client.endpoint.<storage-account-name>.dfs.core.windows.net", "<azure-ad-endpoint>")
```
4. Set the `enableServicePrincipalAuth` option to `true` in the Databricks notebook to enable OAuth 2.0 authentication with the service principal.
5. Configure the Azure Synapse connector to use the same service principal for authentication by setting the following Spark properties:
```python
spark.conf.set("spark.synapse.linkedServiceName", "<linked-service-name>")
spark.conf.set("spark.synapse.sqlContext", "<sql-context-name>")
spark.conf.set("spark.synapse.oauth2.client.id", "<service-principal-id>")
spark.conf.set("spark.synapse.oauth2.client.secret", "<service-principal-secret>")
spark.conf.set("spark.synapse.oauth2.client.endpoint", "<azure-ad-endpoint>")
```
6. Use the Azure Synapse connector to read or write data to Azure Data Lake Storage Gen2 using the service principal for authentication.

By following these steps, you can configure access to Azure storage for both Databricks and Synapse using OAuth 2.0 authentication with a service principal.