Troubleshooting Logic Apps Email Notifications: Key Vault Secret Expiry
Problem: You've set up a Logic App to send email notifications when a Key Vault secret is about to expire, but the emails aren't arriving in your Outlook inbox.
Rephrased: Your automated system designed to warn you about expiring secrets in Key Vault isn't working. You're expecting emails to alert you, but they're not showing up.
Scenario & Code
Let's imagine you have a Logic App named "Key Vault Secret Expiry Notification" with the following steps:
- Recurrence Trigger: Runs every day.
- List Key Vault Secrets: Retrieves a list of all secrets in your Key Vault.
- For Each: Loops through each retrieved secret.
- Get Secret: Retrieves the secret's details.
- Calculate Expiration Date: Calculates the secret's expiration date based on its "expires" property.
- Check Expiration: Checks if the calculated expiration date is within a specified timeframe (e.g., 30 days).
- Send Email (Outlook): Sends an email notification using an Outlook connector.
Code Snippet (Simplified):
{
"definition": {
"$schema": "https://schema.management.azure.com/schemas/2015-08-01/workflowdefinition.json#",
"actions": [
{
"type": "Microsoft.Azure.Connectors.Common/Recurrence",
"inputs": {
"frequency": "Day",
"interval": 1,
"schedule": {
"startTime": "00:00:00"
}
},
"runAfter": {}
},
{
"type": "Azure/KeyVault/ListSecrets",
"inputs": {
"vaultBaseUrl": "https://your-vault-name.vault.azure.net",
"maxResults": 100
},
"runAfter": {
"Recurrence": [
"Succeeded"
]
},
"outputs": {
"value": "@body('List_Key_Vault_Secrets')",
"secrets": "@body('List_Key_Vault_Secrets')['value']"
}
},
{
"type": "Microsoft.Azure.LogicApps/Workflows/ForEach",
"inputs": {
"items": "@outputs('List_Key_Vault_Secrets')",
"actions": [
{
"type": "Azure/KeyVault/GetSecret",
"inputs": {
"vaultBaseUrl": "https://your-vault-name.vault.azure.net",
"secretName": "@item()['name']"
},
"runAfter": {},
"outputs": {
"value": "@body('Get_Secret')",
"secret": "@body('Get_Secret')['value']",
"expires": "@body('Get_Secret')['expires']"
}
},
{
"type": "Microsoft.Azure.LogicApps/Workflows/Compose",
"inputs": {
"expression": "@addDays(utcNow(), 30)"
},
"runAfter": {
"Get_Secret": [
"Succeeded"
]
},
"outputs": {
"compose": "@outputs('Compose')",
"expiryDate": "@outputs('Compose')"
}
},
{
"type": "Microsoft.Azure.LogicApps/Workflows/Condition",
"inputs": {
"expression": "@lessOrEquals(utcNow(), outputs('Compose')['compose'])",
"actions": [
{
"type": "Microsoft.Azure.Connectors.Outlook/Outlook",
"inputs": {
"authenticationType": "ManagedServiceIdentity",
"body": {
"subject": "Key Vault Secret Expiring Soon",
"body": "Secret '@item()['name']' will expire soon!"
},
"to": "[email protected]"
},
"runAfter": {}
}
]
},
"runAfter": {
"Compose": [
"Succeeded"
]
}
}
]
},
"runAfter": {
"List_Key_Vault_Secrets": [
"Succeeded"
]
}
}
]
}
}
Potential Causes & Troubleshooting
- Incorrect Outlook Connector Configuration:
- Authentication: Ensure the Outlook connector is configured to use Managed Service Identity (MSI) and has the necessary permissions to send emails from the Logic App's identity.
- Recipient Email Address: Verify the "to" field in the "Send Email (Outlook)" action is correct.
- Email Subject/Body: Check if the subject and body content is being properly formatted and doesn't contain any invalid characters or formatting issues.
- Key Vault Permissions:
- Logic App Identity: The Logic App needs read permissions to access the Key Vault. Ensure its managed identity has appropriate access.
- Secret Expiration: Check if the secrets are actually expiring. Sometimes, secrets might have a very long or indefinite expiry, so they might not trigger the notification logic.
- Logic App Execution Issues:
- Trigger: Double-check that the recurrence trigger is running successfully and triggering the Logic App at the desired interval.
- Other Actions: Inspect the outputs and errors of other actions within the Logic App to rule out any problems in the secret retrieval, expiration calculation, or condition evaluation.
- Network Connectivity:
- Outbound Connectivity: Make sure the Logic App has outbound connectivity to send emails.
- Firewall Rules: Check if any firewalls or network security groups are blocking outbound email traffic from the Logic App's resource group.
- Outlook.com Issues:
- Spam Filter: The emails might be going to your spam folder. Check your spam folder and ensure that emails from your Logic App are not being blocked.
Troubleshooting Steps
- Test the Outlook Connector: Create a simple Logic App that only sends a test email using the same Outlook connector to verify that the connection and permissions are working correctly.
- Check Execution History: Review the Logic App's execution history to see if the email action has been triggered and if there are any error messages associated with it.
- Debug the Logic App: Use the Logic App's built-in debugger to step through the workflow and inspect the values of variables at each step. This will help identify any issues in the logic or data handling.
- Log Events: Configure logging in the Logic App to capture more detailed information about the execution of the email action. This can provide valuable insights into the cause of the issue.
- Verify Key Vault Permissions: Make sure the Logic App has the necessary permissions to read secrets from the Key Vault.
- Check Secret Expiration: Ensure that the secrets are actually expiring within the timeframe you're checking.
Additional Tips
- Use a dedicated email account: Consider using a dedicated email account for notifications to avoid accidental blocking or spam filtering issues.
- Include more information in the email: Provide details about the secret name, expiration date, and any other relevant information in the email notification. This will make it easier to identify the issue and take action.
- Monitor the Logic App's health: Regularly monitor the Logic App's execution history and health to identify any potential issues early on.
Resources
By carefully reviewing the configuration and troubleshooting steps outlined above, you should be able to identify and resolve the issue preventing your Logic App from sending email notifications about expiring Key Vault secrets.
