Power BI Rest API authentication token error

[gauthamboppana]

I am try get the authentcation token for the Power BI REST api.

Getting the below error.

Followed the solution from the below link, buy no luck.
  https://community.powerbi.com/t5/Power-Query/Connect-to-API-Bad-Request-Error/td-p/910259

Please can any one guide me. 

[gauthamboppana]

@lbendlin  - Yes, that's not the issue :). Tha just my mistake when grabbing the sample screenshot.

[lbendlin]

OK, so here's the bad news.  According to Chris Webb you cannot use OAUTH2 authentication with the Power BI REST API from within Power Query.  You can only use AAD auth (which is a simplified subset of OAUTH2).

[lbendlin]

You have a typo - "TennatID"