Forbidden Issue with PowerBiClient

[Irshad_aj]

Hi Geeks,
Currently I am working with Power Bi apis and embedding. I have tried to get embed token using powerBi client by pbiClient.Reports.GenerateTokenAsync() method. But I got exception , says "Operation returned an invalid status code 'Forbidden'" .
I have given 'workspaceId', 'reportId', 'tokenRequest ' as parameters. wokspaceId and reportId are correct. tokenRequest is a GenerateTokenRequest object and value of it when it passes to pbiClient.Reports.GenerateTokenAsync() method is :

AccessLevel : {View}
AllowSaveAs : null
DatasetId : //a dataset id
Identities : null
LifetimeInMinutes : null

Do I have to enable something while creating or publishing report for embed a pbi report either in PowerBi Desktop or in my code ?
What do you think about the conditions to get that exception ?

Did I miss any any information ? please let me know.

Note:
**I am incharge for generate tokens, embedURLs etc and, powerBi report making and publishing is done by some one else**
My project have already embedded so many report as far. I am experiencing this issue while trying to adding/embedding newly created Bi reports.
Woking on .NET6