How to forward event invitation to other calendar (Power Automate)

“I’ve got multiple calendars to synchronise, can I somehow forward every event invitation to all calendars, maybe with a Power Automate flow?”

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If you work for multiple companies, it’s quite common to have also multiple mailboxes. And with multiple mailboxes come also multiple calendars that various colleagues will access. Which can be a problem when looking for an available meeting time… How do you make sure that the calendars are synchronised? That users won’t book a time slot that’s already occupied in the second calendar? That each event invitation will appear instantly also in the other calendars?

Forward the invitation with a flow

There’s already an article on forwarding your events to other users, but that works only for events you created. If you’re not the initiator you can’t update it, you can’t extend the invitation directly. You must forward the event as you normally do manually.

Since you can do it, there’s a high chance Power Automate can do it for you as well, even though there’s no dedicated action to “Forward an event”. As many times before, the trick is in using an HTTP request, this time to the Graph API.

Add the Office 365 Outlook action “Send an HTTP request” to your flow and configure it with the HTTP request below.

URI:
https://graph.microsoft.com/v1.0/me/events/<eventId>/forward

Method:
POST

Body:
{
  "ToRecipients": [
    {
      "emailAddress": {
        "address": "<emailAddressToForward>"
      }
    }
  ]
}

If you need to forward it to multiple email addresses add multiple objects in the “ToRecipients” array, e.g.

{
  "ToRecipients": [
    {
      "emailAddress": {
        "address": "<emailAddressToForward>"
      }
    },
    {
      "emailAddress": {
        "address": "<emailAddressToForward2>"
      }
    }
  ]
}

That’s it, you just forwarded the event to as many other calendars as needed.

Summary

Since there’s no dedicated action to forward an event in Power Automate, you must resend the invitation via Graph API. All you need is the event id (from the trigger) and the email addresses for forwarding. A flow with two actions that’ll keep all your calendars up to date, at least until somebody starts rescheduling these events…

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