Unable to Retrieve Direct Line Token from Copilot Studio Web Application Channel – "RouteNotFound"

Question

Hi everyone,

I'm currently trying to integrate a Microsoft Copilot Studio bot into a custom web application. The bot is:

• Published from Copilot Studio (Power Platform)
• Has "Secure access required" enabled
• Does not use authentication (no Azure AD, open to all channels)

In the Web Application channel, I copied the Connection string that looks like this:

https://{ENV}.environment.api.powerplatform.com/copilotstudio/dataverse-backed/authenticated/bots/cr405_copilotAssistant/conversations?api-version=2022-03-01-preview

According to this Microsoft documentation, calling that endpoint should return a Direct Line token.

However, when I perform a GET request (in browser or curl), I get the following error:

{
  "code": "RouteNotFound",
  "message": "The request URI does not match any known API routes."
}

I’ve also tried:

• POST and GET requests with and without headers
• Reviewing both Web Application and Mobile Application channels — neither token endpoint worked as expected

I’m confused because:

• Example URLs from Microsoft documentation (like the one with /directline/token?api-version=2022-03-01-preview) do return a valid token
• My environment URL and bot ID are different, and the /conversations endpoint seems invalid

Any help would be highly appreciated — I’ve been stuck trying all combinations.

Thanks in advance!

Answer 1

Hi Nathan,

Thanks for reaching out! The error you're seeing ("RouteNotFound") is happening because the /conversations endpoint you're using isn’t meant to return a Direct Line token.

To resolve this, please use the following endpoint instead:

POST https://{ENV}.environment.api.powerplatform.com/copilotstudio/directline/token?api-version=2022-03-01-preview

Also, make sure to include this header in your request:

Authorization: Bearer <your_web_channel_secret>

You can find the secret in your Copilot Studio Web Application channel settings.

For reference, here are some helpful documents:

• Copilot studio refrence
• Copilot Studio in Copilot for M365

Best regards,

Karan Shewale.

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