Microsoft Power Automate Not Working? Common Errors & Fixes

If a Power Automate flow does not trigger, check the flow Details page for a trigger error, fix any broken connection, review trigger conditions and DLP policy, then edit and save the flow to re-register the trigger.

Open the failed run in the 28-day run history, read the red action's error code, and match it: 401/403 means reconnect or permissions, 400/404 means fix the action settings, 429 means throttling, 500/502 means resubmit.

A previously working flow that now returns 401 Unauthorized usually has an expired or broken connection. Go to Connections, select Fix connection and sign in again.

Power Automate turns off flows that fail continuously or are throttled for 14 days, and flows with no trigger for 90 days unless the owner has a premium license. Fix the cause, turn the flow back on and keep it triggering.

A 429 means a connector's rate limit was hit. Add retry with exponential backoff or a Delay, lower concurrency, filter queries to fetch fewer items, or move heavy flows to a Process license.

Slow flows usually come from a slow downstream service, connector throttling, exceeding daily action limits for your plan, or big loops. Check Analytics, cut actions and data, or move to a Process license.

Flows using premium connectors need the owner (and for instant flows each user) to hold a Premium or Process license. Assign a license or a Process license to the flow, then resave it.

Excel actions only work on formatted tables, not plain ranges. Create an Excel table, refresh the connection, reselect the file and table, or use Get tables to pass the name dynamically.

Unattended desktop flows fail when screen resolution, window mode or user sessions differ from attended runs. Match display settings, sign out of the machine, recapture selectors and check the UI flow service.

SharePoint triggers like 'When a file is created or modified' do not fire for files in subfolders, and can miss events from permissions or trigger conditions. Create flows for subfolders and verify access.

Duplicate runs come from the at-least-once design of the service or copies of the flow in other environments. Make flows idempotent and add trigger conditions.

Power Automate licenses are managed by a Global or Billing admin in the Microsoft 365 admin center under Billing, Your products. Cancel there, or turn off recurring billing so access ends at the term end. Check refund terms first.