403 without error message when trying get embedded token

Hello

I've got a report in power bi published from power bi desktop

I want to display it in web application.

I created aaplication in azzure, I have client id, tenant and client secret. Also I have reportId and workspace/groupId 

I filled config.js with proper data using nodejs project https://github.com/microsoft/PowerBI-Developer-Samples/tree/master/NodeJS

and it says that I am unauthorized - I get 403 but no error message:

"Error while retrieving report embed details

Unauthorized"

In azure in app permissions I have Dataset.Read.All and Report.Read.All

Can somebody tell me what I am doing wrong?

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Regards, 

Nego