Copilot Cowork Shows 'Not Delivered' / Skeleton Loading Error When Submitting Prompts

Linh Pham Tien 0 評価のポイント
2026-05-28T06:46:12.6166667+00:00

Hello Microsoft Support Team,

We are currently experiencing an issue with Copilot Cowork.

When entering a prompt, the request is not processed successfully and sometimes displays messages such as:

  • "Not delivered. Retry?"

"配信されていません"

or the screen gets stuck in a skeleton/loading state.

We have already tried:

refreshing the session

creating a new chat

shortening the prompt

clearing browser cache/cookies

However, the issue still occurs intermittently.

Could you please help us confirm:

What is the root cause of this issue?

Is this related to Frontier/Cowork preview limitations or backend timeout?

Are there any known limitations regarding prompt size, scheduled tasks, or Microsoft Graph context retrieval?

Is there any recommended workaround or configuration to avoid this issue?

Thank you in advance for your support.Hello Microsoft Support Team,

We are currently experiencing an issue with Copilot Cowork.

When entering a prompt, the request is not processed successfully and sometimes displays messages such as:

"Not delivered. Retry?"

"配信されていません"

or the screen gets stuck in a skeleton/loading state.

We have already tried:

refreshing the session

creating a new chat

shortening the prompt

clearing browser cache/cookies

However, the issue still occurs intermittently.

Could you please help us confirm:

What is the root cause of this issue?

Is this related to Frontier/Cowork preview limitations or backend timeout?

Are there any known limitations regarding prompt size, scheduled tasks, or Microsoft Graph context retrieval?

Is there any recommended workaround or configuration to avoid this issue?

Thank you in advance for your support.

Microsoft Copilot | Windows Copilot | Copilot+ PC
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  1. Lucus-V 13,485 評価のポイント Microsoft 外部スタッフ モデレーター
    2026-05-28T17:42:51.12+00:00

    Hi Linh Pham Tien,

    Please note that this is Microsoft Q&A forum for Japanese region. However, you have made this thread using English, so I will respond in English also.

    At this time, we don't have any official information from Microsoft about this issue, and we don't have the ability or permission to access back-end systems to check what might be happening in the background. Therefore, we regret that we cannot give you a more concrete answer here.

    The behavior you're experiencing is often related to network problem. You may take some suggestions bellow to see if they help:

    • Try again another time.
    • Change your network if possible.
    • Use custom DNS such as Google (8.8.8.8 and 8.8.4.4) or Cloudflare (1.1.1.1 and 1.0.0.1) or etc.
    • Use network from mobile hotspot.
    • Try with another computer or device.

    If you have further information, please feel free to let me know.

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