I’m facing an issue while connecting LinkedIn OAuth with n8n, and I’m hoping someone here can point me in the right direction.
Here’s the situation:
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I have created a custom LinkedIn app
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The app is fully verified
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OAuth flow works perfectly in Postman
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Access token is generated successfully outside n8n
However, when I enter the same client ID, client secret, and redirect URI in n8n, the LinkedIn account connection fails.
I keep getting this error:
{
"error": "invalid_request",
"error_description": "Unable to retrieve access token: appid/redirect uri/code verifier does not match authorization code. Or authorization code expired. Or external member binding exists"
}
Things I’ve already checked:
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Redirect URI matches (as per LinkedIn app settings)
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App credentials are correct
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App permissions/scopes are approved
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OAuth works fine via Postman
It feels like something specific to n8n’s OAuth implementation (PKCE / redirect handling / cached auth?) but I’m not able to pinpoint it.
Has anyone:
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Successfully connected a custom LinkedIn app with n8n?
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Faced this exact error before?
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Found a workaround or configuration fix?
Any guidance, docs, or practical tips would be highly appreciated 
Thanks in advance — really looking forward to resolving this.
