Hey @CU04091338-0, Kindly check the following, as these are the most common reasons for the ResourceNotFound / User not found error: Check for spaces in the email Please make sure there is no space at the start or end of the email address. Even a small extra space will cause this error. Verify the correct UPN Some users have email aliases. Many users have multiple email addresses, but only one primary UPN. You can confirm the correct UPN directly from Microsoft Entra ID (Azure AD) by searching for the user and checking the User Principal Name field. Example: Actual UPN: john.doe@company.onmicrosoft.com Email alias (used for mail): john@company.com If you pass the alias instead of the real UPN, the action often fails because it expects the unique principal name. B2B or guest users If the person is a guest (B2B) user, their UPN usually looks like this: user_external.com#EXT#@yourcompany.onmicrosoft.com Using their normal external email address (user_external.com) will not work and will result in User not found. Use the Object ID If you already have the user’s Object ID (GUID) from a previous step, use that instead of the email address. This action supports both. Hope this helps!
