You are trying to access secrets, when you get an error message.
com.databricks.common.client.DatabricksServiceException: INVALID_STATE: Databricks could not access keyvault: https://xxxxxxx.vault.azure.net/.
There is not a single root cause for this error message, so you will have to do some troubleshooting.
Confirm permissions are correctly set on the key vault
- Load the Azure Portal.
 - Open Key vaults.
 - Click the key vault.
 - Click Access policies.
 - Verify the Get and List permissions are applied.
 
Inspect the firewall configuration on the key vault
- Load the Azure Portal.
 - Open Key vaults.
 - Click the key vault.
 - Click Networking.
 - Click Firewalls and virtual networks.
 - Select Private endpoint and selected networks.
 - Verify that Allow trusted Microsoft services to bypass this firewall? is set to Yes.
 - Attempt to access the secrets.
 

If you can view the secrets, the issue is resolved.
If you are still getting the INVALID_STATE: Databricks could not access keyvault error, continue troubleshooting.
List all secrets in the secret scope
- Open a notebook.
 - List all secrets in scope.
 
%python
dbutils.secrets.list("<scopename>")Try to access individual secrets
Try to access a few different, random secrets.
%python
dbutils.secrets.get("<KeyvaultSecretScope>", "<SecretName>")If some secrets can be fetched, while others fail, the failed secrets are either disabled or inactive.
Enable individual secrets
- Load the Azure Portal.
 - Open Key vaults.
 - Click the key vault.
 - Click Secrets.
 - Click the secret and verify that the status is set to Enabled.
 

If the secret is disabled, enable it, or create a new version.
Verify that individual secrets are working
Try to access the previously failed secrets.
%python
dbutils.secrets.get("<KeyvaultSecretScope>", "<SecretName>")You can fetch all of them.