Issues with Custom Connector in Power Apps for LinkedIn Post Integration

Hi Community,

I am learning how to post an article on LinkedIn using Power Automate. I created an Instant Cloud Flow with Power Virtual Agent (PVA) as the trigger. For the action, I selected a third-party service to post an article, filled in all the necessary details, and clicked save. Since I’m using PVA as the trigger, a custom connector is required to run the flow. I created an app in the Developer Portal to obtain the Client ID and Client Secret. I added products like Share on LinkedIn and Sign In with LinkedIn using OpenID Connect for the scope. Currently, we only have the w_member_social scope available, while r_liteprofile and r_emailaddress are missing and not available. However, while generating the access token, we can select scopes like openid, profile, w_member_social, and email. After that, I started creating the custom connector in Power Apps, following the six required steps:

1. General Information

Scheme: Selected HTTPS

Host: api.linkedin.com

Base URL: /

2. Security

Authentication Type: OAuth 2.0

OAuth 2.0 Settings:

Client ID: 1234567

Client Secret: xx667788

Authorization URL: https://www.linkedin.com/oauth/v2/authorization Token URL: https://www.linkedin.com/oauth/v2/accessToken Refresh URL: https://www.linkedin.com/oauth/v2/accessToken Scope: w_member_social

Redirect URL: https://global.consent.azure-apim.net/redirect/linkedinget-5f45760dxx (This URL is pasted under the Auth settings.)

3. Definition

Action:

Summary: LinkedInPost

Operation ID: LinkedInPost

Visibility: Selected None

Import from Sample (Request Tab):

Method: POST

URL: https://api.linkedin.com/v2/ugcPosts

Headers: Bearer Token: Bearer [Access Token] (I am unable to add extra headers here.)

Body:

{

"author": "urn:li:person:xxxxx",

"lifecycleState": "PUBLISHED",

"specificContent": {

"com.linkedin.ugc.ShareContent": { "shareCommentary": {

"text": "Check out this insightful article on SQL best practices! #SQL #BestPractices"

"shareMediaCategory": "ARTICLE",

"media": [

{

"status": "READY",

"originalUrl": "https://www.geeksforgeeks.org/best-practices-for-sql-query-optimizations/",

"title": "SQL Best Practices",

"description": "Best practices for SQL query optimization."

}

]

}

"visibility": { "com.linkedin.ugc.MemberNetworkVisibility": "PUBLIC"

}

4 & 5. (Skipped these steps for now)

6. Test

Clicked on "New Connection" and selected "Create".

A LinkedIn login window appeared; I logged in and clicked "Allow".

This redirected me to the connection page in Power Apps.

In the custom connector, I clicked "Edit" → "Test" tab → "Test Operations".

Issue:

I am encountering multiple errors when testing the operation: 400 (Bad Request) - Missing Version 401 (Unauthorized) - Token Revoked 422 (Unprocessable Entity) 404 (Not Found) - Resource Not Found I’m unsure if this is related to incorrect OAuth settings, missing scopes, or API configuration. Could you please review and guide me on how to resolve these issues.

Regards,

Sathya Sai.

Categories:

Authentication

Below corrections might be required in your custom connector configuration:

LinkedIn API versioning is required in headers (X-Restli-Protocol-Version). Please have a look at this article - https://learn.microsoft.com/en-us/linkedin/shared/api-guide/concepts/protocol-version
Authorization: Bearer {Access Token}
X-Restli-Protocol-Version: 2.0.0
LinkedIn-Version: 202310
Content-Type: application/json
Make sure the Access Token actually has the w_member_social permission when posting.
401 Unauthorized =>This might be possible that the token expired (tokens are short-lived unless refreshed) OR You used wrong redirect URL when authorizing.

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Thanks,

Vipul

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