@Anurag Ranjeet​ below article will provide you clear insight, to be clear it looks user who ever is consumer in BI does not have token usage permission. you need to initially add them in databricks token usage permissions as (can use)--> this user will get inherited with service principle.

you can follow below steps in article (same steps that you done, only thing seems to be missing is user seems be missing with token usage access. try to create new group--> add user in group--> can use permission)

one more conflict here is , your user should be part of admin, you should not get that error. but try to add u r user in new group --> validate

https://kb.databricks.com/en_US/notebooks/service-principal-cannot-create-access-token