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How to Fix a 403 Error When Power Automate Creates an Azure Blob
Question details
The user needs to resolve a 403 authorization error that occurs when a Power Automate flow attempts to create or copy files to Azure Blob Storage.
- Product
- Power Automate, Azure Blob Storage
- Device & OS
- not provided
- Scenario
- Using a Power Automate flow to copy files from SharePoint into Azure Blob Storage.
- Observed behavior
- The flow fails and returns a 403 authorization error, even though the user can successfully manage storage using standard Azure management tools.
Verify that your Azure Storage account firewall is not blocking the Power Automate IP addresses, and ensure you have your exact error message copied for troubleshooting.
Verify Storage Permissions and Connector Identity
Check your Azure role assignments and connector settings to ensure Power Automate has the correct authorization to write data to the blob.
Having administrative access to an Azure Storage account does not automatically grant data access. Power Automate requires specific data-plane permissions to create or modify blobs.
Log in to the Azure Portal, navigate to your Storage Account, go to Access Control (IAM), and ensure your connection identity has the 'Storage Blob Data Contributor' role assigned.
In Power Automate, go to Data > Connections. Locate your Azure Blob Storage connection and verify it is authenticating with the account that has the correct Azure permissions.
In the Azure Portal, under the Security + Networking section of your Storage Account, ensure that the firewall allows access from trusted Microsoft services or the specific IP ranges used by Power Automate.
Consult the Microsoft Power Automate Community
If permissions and networking rules appear correct, post your detailed issue to the official community for advanced troubleshooting from Microsoft experts.
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Frequently Asked Questions
Why do I get a 403 error in Power Automate when I have Azure portal access?
Having management access in the Azure portal utilizes control-plane permissions, which are different from data-plane permissions. Your Power Automate connector specifically needs data-plane roles, such as 'Storage Blob Data Contributor', to read or write blob content.
Can Azure Storage firewall settings cause a 403 error in Power Automate?
Yes. If your Azure Storage account is configured to allow access only from selected networks, requests from Power Automate will be blocked and return a 403 error. You must explicitly allow access from trusted Microsoft services.
How do I update or fix the connection identity in Power Automate?
Navigate to the Data > Connections menu in your Power Automate dashboard, locate your Azure Blob Storage connection, click the ellipsis (three dots), and select 'Switch account' or 'Update' to re-authenticate with the correct credentials.
