Post to social media from Microsoft Power Automate

Post from Power Automate to social media, step by step

About fifteen minutes. PostWire's REST API is on its free plan: 1 business, 10 posts a month, 5 AI drafts a day, 2 networks per post, no card. On Power Automate's side, Microsoft's licensing FAQ says free and Microsoft 365 plans "can only access standard connectors"; if the designer marks the HTTP action Premium in your tenant, it needs Power Automate Premium ($15.00 per user a month, paid yearly, on Microsoft's pricing page on Oct 26, 2026).

1. Create a free PostWire account and connect your networks

   Open the dashboard and sign in with your email: a 6-digit code, no password, no card. Connect the accounts the flow should post to (Instagram, TikTok, YouTube, LinkedIn, Facebook Pages, Bluesky and the rest), each with the network's own sign-in.

2. Create an API key

   Under API & MCP press Create key and copy it (it starts with pw_live_). The flow sends it in a header, never in the URL.

3. Start the flow from your content

   Create an automated cloud flow and pick the trigger that should cause a post. The example below uses SharePoint's When an item is created on a list with the columns Caption, ImageUrl and PostAt. For a fixed rhythm, pick a scheduled cloud flow instead: Microsoft's own example is the Recurrence trigger with Interval 1 and Frequency Week for once a week.

4. Add the HTTP action

   Add HTTP as the next step and fill its fields: Method POST · URI https://postwire.io/api/schedule · Headers two rows, one with your key · Body the JSON below.

   Method:  POST
   URI:     https://postwire.io/api/schedule
   Headers: Authorization   Bearer YOUR_POSTWIRE_API_KEY
            Content-Type    application/json
   Body:
   {
     "platforms": ["instagram", "linkedin", "facebook"],
     "text": "CAPTION",
     "photo_url": "IMAGE_URL",
     "run_at": "POST_AT"
   }

5. Swap the capitals for dynamic content

   Place the cursor on CAPTION, IMAGE_URL and POST_AT in turn and pick the list's Caption, ImageUrl and PostAt from the dynamic content panel. run_at takes an ISO 8601 time up to 365 days ahead, or "next_slot" for the brand's next free queue slot. PostWire checks the connections and the media for every network when the flow sends it, not at posting time, so a missing image or an unconnected network fails the run now.

6. Test the flow and open the posts

   Add an item to the list and open the flow's run. The HTTP action's output shows what PostWire answered: the schedule and its networks, or the field it refused and why. When the time comes, the post appears under History in the PostWire dashboard with each network's live link.

To publish at once instead of at a time, change the URI to https://postwire.io/api/post, drop run_at and add "idempotency_key" with the item's ID: an item the flow sends twice within 24 hours is then published once. Instagram needs an image or a video; for networks that take text alone (LinkedIn, Bluesky, Telegram, Mastodon, X) photo_url can go. For video, send video_url with a public link; YouTube also wants a title.