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Power Automate
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Urgent: Power Automate: Entra ID Guest accounts provisioned via SharePoint external sharing.

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Posted on by SA-13062119-0

We have an internal employee onboarding Power Automate flow using the Office 365 Users trigger "When a new user is created".Recently, an employee shared a folder securely via SharePoint Online with new external partners. This automatically provisioned background Entra ID Guest User accounts (with the #EXT# UPN suffix).Our Power Automate trigger unexpectedly captured these guest directory provisions, treated them as new internal employees, and incorrectly sent our corporate onboarding welcome emails to the external guest addresses.

The production flow is currently unmodified. We need Microsoft Support to help us:

  1. Provide the proper OData filter query or trigger condition to ensure the trigger only fires for internal Member accounts and entirely ignores Guest accounts.

  2. Help us safely implement a validation step to prevent this behavior from happening on future external shares.

Categories:
Power Automate Desktop
I have the same question (0)
  • André Arnaud de Calavon Profile Picture
    André Arnaud de Cal... 679 on at
    Hi,
     
    Can you tell the exact name of the trigger or share a screenshot? In my environments, I don't have a trigger on the Office 365 Users connector.
  • Suggested answer
    chiaraalina Profile Picture
    chiaraalina 2,425 Super User 2026 Season 1 on at
     
    Add a Trigger Condition that prevents the flow from running when a Guest user is created. This stops execution before any actions occur.
     
    Select the "When a new user is created" trigger and click on Settings and under Trigger Conditions click Add. 

    Add this expression:
     
    @and(equals(triggerBody()?['userType'], 'Member'), not(contains(triggerBody()?['userPrincipalName'], '#EXT#')))
     
    Save and test 
     
    Flow will not run at all for Guest accounts and no run history is logged.
     
    Hope it helps!

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