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How to diagnose a failed Power Automate run
- Open the run: In the flow’s run history, open the failed run and select the action marked as failed.
- Read the actual error: Note the status code, error message, and which action produced them. Do this before editing the flow; the visible message distinguishes a bad reference from throttling or a timeout. See Microsoft’s cloud flow troubleshooting guidance.
- Classify the cause: Decide whether the failure is a configuration problem, a temporary service or network issue, throttling, or an operation that exceeded a time boundary.
- Choose the matching remedy: Correct invalid references or configuration directly; reserve retries for failures that could clear with time.
What common Power Automate errors mean
| Failure | What it usually indicates | What to do | Can a retry help? |
|---|---|---|---|
| 404 Not Found | A referenced list, file, mailbox, endpoint, or other resource may have been deleted, renamed, or moved. | Verify the current resource path or identifier and update the action. | Not when the reference is stale; the same request will not make the resource reappear. |
| 429 Too Many Requests | The connector or API is enforcing a rate or usage limit. | Reduce request frequency, batch or spread work where appropriate, and use backoff. For Microsoft Graph, honor Retry-After when returned. |
Often, after an appropriate delay; immediate retries can add pressure. |
| Action timeout | An individual action exceeded its configured timeout, often during a slow external call or wait. | Check the action’s timeout settings and the external operation’s expected duration. Use a timeout route or asynchronous polling design when supported. | Only if the cause is temporary and the operation can safely be retried. |
| Whole-run duration limit | A long-running flow exceeded its maximum run duration. | Split the process or use a relay/state pattern to pass work into another run. | Simply retrying the same long-running design does not remove the duration limit. |
| Transient 5xx or network failure | The service or network may be temporarily unavailable. | Use bounded backoff, then log and surface a persistent failure. | Often, provided the operation is safe to repeat. |
Connector throttling limits vary. Check the specific connector’s limits rather than treating a 429 as proof that the flow has exceeded a daily action allowance. Microsoft explains the distinction in its guidance on platform limits and throttling; status codes and resource errors are covered in its troubleshooting reference.
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How to route failures with Try and Catch scopes
A Try/Catch pattern gives the flow a deliberate route for errors instead of letting later actions run as if the main operation succeeded. Microsoft documents scopes as a way to build try/catch/finally patterns; scope results include statuses such as Succeeded, Failed, and Skipped. See Use scopes to organize actions in cloud flows and Employ robust error handling.
- Create a Try scope and place the main business operation inside it.
- Create a Catch scope. On the Catch scope’s menu, choose Configure run after for the preceding Try scope. Select the relevant failure statuses, such as has failed or has timed out; include other statuses only if the scenario requires them.
- Capture and log context. Preserve useful details from the failed action—such as its name, status, and error message—and write them to an appropriate logging system. Avoid logging secrets or sensitive data unnecessarily.
- Notify only when action is needed. Send a targeted alert when a person must intervene, rather than notifying on every failure and creating alert noise.
- Control what happens next. If downstream work must not continue after an unrecovered error, terminate the flow or configure later actions to run only after success. Give the run a clear success or failure outcome.
When and how to retry an action
Retries are for plausible transient failures, not a substitute for fixing a broken reference, credentials, or configuration. Microsoft recommends retry policies for intermittent network or service problems and supports fixed or exponential intervals. Exponential backoff increases the wait between attempts, reducing repeated pressure on an unhealthy service. A retry policy is not a guarantee of recovery: persistent failures should still reach the Catch path for logging and follow-up. See Microsoft’s error-handling guidance.
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For Microsoft Graph, honor Retry-After
When a Microsoft Graph response supplies Retry-After, wait for that duration before retrying. If the response does not provide it, Graph guidance recommends exponential backoff rather than an immediate repeat. Failed requests can continue to count toward usage, so immediate retries may worsen throttling. See Microsoft Graph throttling guidance.
Know the documented retry-setting boundaries
Microsoft’s Power Automate limits documentation lists a maximum retry-attempt setting of 90, a maximum delay of one day, and a minimum delay of five seconds. These are platform setting limits, not recommended values for every action. The page also describes defaults that vary by performance profile: up to two default retries for Low, and up to 12 for Medium and High. Confirm the live limits and the connector’s behavior before relying on a particular setting.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to troubleshoot Power Automate timeouts
Action timeout
First determine whether one action timed out or the entire run reached its duration limit. For an individual action, check its settings and whether the external operation normally takes longer than the action allows. If the operation supports asynchronous completion, use polling—such as an Until loop—or another supported asynchronous pattern instead of holding a synchronous request open. Microsoft’s limits page lists 120 seconds for outbound synchronous requests and 120 seconds for inbound requests, while noting that some connector operations use longer asynchronous or webhook behavior. These are documented platform boundaries, not a promise that every connector operation behaves identically.
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Whole-run duration
Microsoft’s cloud flow error code reference states a maximum run duration of 30 days. A process that cannot finish within that boundary needs a different design: end one run and start another, passing state through Dataverse or a file, or split the work into smaller processes.
A test timeout may not mean the run stopped
Microsoft’s limits documentation says a cloud-flow test lasting longer than 10 minutes can display a timeout even while the flow continues running in the background. Reopen the run view to check its current status before treating the test message as proof that execution ended.
Quick Recap
Match the remedy to the failure
- Resource not found (404): Check whether the target moved, changed name, or was deleted; update the path or identifier.
- Throttling (429): Reduce request pressure and back off; use the returned
Retry-Afterfor Microsoft Graph when present. - Temporary 5xx or network error: Use a bounded retry policy, then capture persistent failure in Catch.
- Action timeout: Check the operation’s expected duration and timeout behavior; use asynchronous polling where supported.
- Run-duration limit: Split the work or pass state to a later run rather than retrying the same oversized process.
- Unrecoverable or unsafe failure: Log the context, notify someone who can act, and prevent dependent steps from continuing.
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