Dynamic crm onprem v8 Web API access from c# application

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Posted on by Path1n1

I have CRM v8 on premises solution with ADFS server authentication configured. im trying to use instance web API https://crmdomain/organization/api/data/v8.2/ from another c# application. I have added application group in ADFS using this article

https://learn.microsoft.com/en-us/windows-server/identity/ad-fs/development/msal/adfs-msal-web-app-web-api

I can generate access token but I cannot query data from entities tried to add token as bearer token return 401 unauthorized

e.g. https://crmdomain/organization/api/data/v8.2/contacts?$select=firstname,contactid,lastname&$filter=emailaddress1 eq 'valueemailaddress' return data when I browse with correct value in emailaddress. but both my c# coding and postman both return error 401

can anyone help me out to sort this please ?