Power BI Rest API gives 403 Error

[subinpius4u]

Am trying to call a Power BI Rest API in a custom connector.
The Rest API is registered in the Azure Active Directory and all the delegated permissions are given.
The App registration was done through the below link. The account used to register does have a power bi pro license and have access to the the Power BI datasets.
Attached are the screenshots of the configuration inside the custom connector.

I am able to get the response in Postman after manually retrieving the token using powershell by logging into my account