HTTPリクエストでフローを呼び出すと呼び出されたフローは正常に実行されるのに呼び出し元でエラーになる（ServiceFlow）

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Posted on by MS-08060836-0

HTTPリクエスト（事前承認）でクラウドフローを呼び出す（「HTTP要求を呼び出す」トリガーを使用する）と、以下のようなエラーが表示される。

{
  "error": {
    "code": "DirectApiAuthorizationRequired",
    "message": "The OAuth authorization scheme is required. Please add authentication scheme and try again.",
    "messageTemplate": "DirectApiAuthorizationRequired"
  }
}

ただし、呼び出されたフローは正常に実行されている。

また別のクラウドフローで同様のアクションを実行した場合は正常に実行される。

先週でこのようなエラーは発生していなかったが今日からエラーが発生し始めた。

接続や接続参照を作り直してみたが状況は変わらなかった。

Categories:

Using flows

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Sunil Kumar Pashikanti 2,318 Moderator on at

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Hi @MS-08060836-0,

If you’re seeing DirectApiAuthorizationRequired even though the flow shows as successful, you’ve likely hit a recent change in how Power Automate handles HTTP trigger security.

Microsoft has tightened OAuth enforcement. In some cases, the flow still runs, but the caller gets blocked at the API layer due to missing authentication.

Quick ways to fix it
Option 1: Quick fix (allow anonymous)

Open your HTTP trigger

Set “Who can trigger the flow?” → Anyone

Save and use the new URL

This works because the new URL includes the required signature (sig).
Note: This makes the endpoint public, so use only if acceptable.

Option 2: Proper fix (OAuth)
If you need it secured:

Register an app in Entra ID

Get a Bearer token (client credentials flow)

Call the flow with header:
Authorization: Bearer <token>

Use scope:
https://service.flow.microsoft.com/.default

Quick checks

Re-save the flow and use the latest URL
If using OAuth, verify token has correct aud and tid

Recommendation
For a quick unblock, use Option 1.
For production, move to OAuth properly.

✅ If this answer helped resolve your issue, please mark it as Accepted so it can help others with the same problem.
👍 Feel free to Like the post if you found it useful.

Sunil Kumar Pashikanti, Moderator
Blog: https://sunilpashikanti.com/posts/

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