How to Fix Power Automate Cloud Flow Registration Failed with Custom Connectors
Question details
Users experience a 'Failed during HTTP send request' error when trying to register a Power Automate cloud flow connected to a Power Apps canvas app using custom connectors.
- Product
- Microsoft Power Automate
- Device & OS
- not provided
- Scenario
- Registering a cloud flow with a Power Apps canvas app using run-only user connections.
- Observed behavior
- The flow registration fails with a 'Failed during HTTP send request' error across multiple environments.
Ensure you have administrator or owner permissions for both the Power Automate cloud flow and the associated Power Apps canvas app before modifying connection references.
Verify Connector Permissions and Run-Only User Settings
Check and adjust the permissions and connection ownership settings to ensure run-only users have the correct access to the custom connector.
The 'Failed during HTTP send request' error often occurs because the account running the flow lacks the necessary permissions to authenticate against the custom connector. Adjusting the run-only permissions ensures the correct connection reference is utilized during execution.
Navigate to the Power Automate portal and open the details page for the affected cloud flow.
Locate the 'Run-only users' section in the bottom right corner of the flow details page and click 'Edit'.
Verify that the connections for the custom connector are set correctly. Choose either 'Provided by run-only user' if users should authenticate themselves, or select a specific authorized connection.
Check the custom connector's sharing settings in the Data section to ensure the runtime users have been granted explicit permissions to use it.
Save the flow configuration and test the registration again directly from the Power Apps canvas app.
Consult the Power Automate Community
If standard troubleshooting fails, escalate the issue to the dedicated Microsoft Power Automate Community for specialized support.
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Frequently Asked Questions
What causes the 'Failed during HTTP send request' error in Power Automate?
This error usually occurs when there are permission mismatches in connection references, incorrect run-only user settings, or network issues preventing the custom connector from reaching its endpoint API.
How do I fix connection reference errors across different environments?
When migrating flows across environments using solutions, you must recreate or re-authenticate connection references in the target environment to ensure the flow connects securely to local resources.
Can run-only users authenticate custom connectors automatically?
Run-only users can authenticate custom connectors if the flow is configured to prompt them for their own credentials upon execution, or if the flow maker has explicitly embedded a shared connection with appropriate access rights.
Why does my canvas app fail to trigger the cloud flow?
The canvas app might fail to trigger the flow if the flow's input parameters were recently changed without refreshing the flow connection inside the Power Apps studio, leading to a schema mismatch.
