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Issue with 'Send HTTP Request' not patching email address to 'Required Attendees'

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Posted on by ahhollan

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Hello! I am creating a registration flow for a training class using this link - https://damobird365.com/update-event-and-hide-attendees/#comment-51700. It's all working except the final 'Send an HTTP' request to an outlook event to update the attendees. I'm seeing the new attendee in the Input JSON body for the step, but it ignores the email and display name when updating the event. Any idea what I can do to correct this?

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Michael E. Gernaey 53,335 Super User 2025 Season 2 on at

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ok... I am going to ask nice, why did you not share your flow, but expect somehow we can magic up an solution for you.

Is that even logical?

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Expiscornovus 33,189 Most Valuable Professional on at

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1. Have you used the same format as in the blog for the Compose action/also see an example in the code snippet below?

[ { "type": "required", "emailAddress": { "address": "jane@contoso.onmicrosoft.com" } } ]

2. What did you used for your union expression?

union(outputs('Send_an_HTTP_request_Get_Attendees')?['body']?['attendees'],outputs('Compose_New_Attendee'))

3. I just double checked, this approach should still work. Below is a screenshot of my test setup which worked ok.

Only difference is that in the current version of Power Automate flow you should be using the Send an HTTP request of the Outlook 365 connector instead of the one of the Office 365 Groups connector (which was used in the screenshots of the blog).

https://learn.microsoft.com/en-us/connectors/office365/#send-an-http-request

Are you using that action as well?

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