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Bearer Tokens in Custom Connector

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Posted on by Rishan

I'm trying to create a Custom Connector to an API endpoint that requires bearer tokens in the header for authentication.

In my Flow, I use a HTTP action to get a token, store it in a variable, and then pass it to my connector in the Authorization header. However, I always receive an Unauthorized error.

I receive this error when I test the connector on the custom connector test page:

{
"status": 400,
"source": "https://power-te-westus-1.azurewebsites.net:443/tokens/msmanaged-na/eum.2Dcreategroup.5F058fd1eee2b36bb6.5Fde5addbef9cce72c/shared-eum.2dcreateg-f412c0af-e8aa-49d6-9d10-76928018c41b/exchange",
"message": "Error from token exchange: Bad authorization token. Could not find identity for access token."
}

However, it succeeds when I use a HTTP action to make a call to the same endpoint as my custom connector. I use the same bearer token in the authorization header.

Is there a way I can get this to work as a Custom Connector?

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v-yamao-msft on at

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Hi @Rishan,

Please take this thread for a reference. You will be able to pass your bearer token to the API successfully by the following steps:

On the Security tab, select "API Key" for the Authentication type

For "Parameter Label" put whatever you want someone to see when they are creating a Connection off of this Connector...I used "API Key"

"Parameter Name" should be "Authorization" (no quotes)

For "Parameter Location", select "Header"

When you create a Connection off of this Connector, you'll be prompted for your "API Key" (or whatever you used for step 2 above)

Enter "Bearer YOUR_BEARER_TOKEN_VALUE" (no quotes)

Please check the thread link for more details:

https://powerusers.microsoft.com/t5/Connecting-To-Data/Authorization-Bearer-in-Header-Custom-Connector/td-p/51541

Best regards,

Mabel Mao

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Rishan 6 on at

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Thank you, that got my flow to complete successfully!

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Community Power Pla... on at

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@Rishan , that looks like a good solution. Sorry to resurrect an old post. I've been able to get to the point where I initialize the bearer token variable , but have been unable to provide it as a value in the Authorization header. Were you able to do that, or does the token go elsewhere in the custom connector that you're using?

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yashag2255 24,769 Super User 2024 Season 1 on at

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Hi @Anonymous ,

Please refer to the screenshot below. You don't even have to initialise a variable for the token:
Expression used :
body('HTTP_Request_Name')['result']
Replace the 'HTTP_Request_Name' with the name of the action in which you are sending the authentication request.

Hope this Helps!

If this reply has answered your question or solved your issue, please mark this question as answered. Answered questions helps users in the future who may have the same issue or question quickly find a resolution via search. If you liked my response, please consider giving it a thumbs up. THANKS!

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kirstenthomas18 15 on at

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Thank you this was a huge help!

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Jeff_Schuler 17 on at

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Hi @yashag2255
I'm having difficulty understanding your post. I'm retrieving a token and storing it in a variable. I don't understand how this populates the 'Authorization' parameter in the custom connector. How does get the bearer token?

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ronn_zw 26 on at

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Hi @Rishan

My token expires every 10 mins so if l use the API key method, l won't be able to refresh the token. Is there a way to pass the token inside Flow?

Thanks

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Community Power Pla... on at

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how to override the dynamic jwt token in custom connector?

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gabeng 32 on at

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I found a solution regarding expiring Bearer Tokens using Policies in Custom Connectors. Policies allow to rewrite headers.
https://powerusers.microsoft.com/t5/Connector-Development/Creating-a-Power-Automate-custom-connector-using-Bearer-Token/m-p/2022427/highlight/true#M2193

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