Authentication BC SaasS API with Ouath2


i’m having issue connecting to Sandbox through Postman.

The app is registered in azure aad and necessary permissions is given. i wad able to finish this guide

But, when trying with following api:

i get this resonse - 401 unathorized

“error”: {
“code”: “Authentication_InvalidCredentials”,
“message”: "The server has rejected the client credentials. CorrelationId: