Tabular Editor 2 "The remote server returned an error:(401) Unauthorized"

[Akircher]

I am new to Power Bi and Tabular Editor.  I discovered this article on personalizing visuals

Let users personalize visuals in a report - Power BI | Microsoft Docs

I wanted to do this with my powerbi dataset which is connected to a existing power bi dataset. I do not have the Data option in my power bi desktop file and I am connected to a live Power Bi Dataset. 

The reason I connected to this dataset is because our IT team already made this dataset row-level secure.  I downloaded tabular editor 2 and after clicking on the external tool I get this 

After researching this topic I always end up on this post. 

Tabular Editor Error 401 - Microsoft Power BI Community

Which points to this post

Solved: Tabular Editor Error 401. Report and Model in sepa... - Microsoft Power BI Community

Which states:

"I skipped a step when working with a "Thin report" and separate Model file.

When trying to create Perspectives, I needed to first open Tabular Editor from the Model file.

Once done and saved, I then needed to refresh the "Thin Report" and the perspectives will be pulled through.

Rule of thumb: always start from the model.

FYI

Thin Report = Power BI Report that does not contain the model. It is instead live connected to a separate model file (either locally or from the Power BI service)"

I did not see any documentation in the solution, but it sounded like there is a way for me to do it.  However, when researching this topic I find myself ending on this post. 

Using Tabular Editor to Manage Relationships in Li... - Microsoft Power BI Community

Which makes it sound like it is not possible to connect to live connections. 

So I would like to know if it is possible to add perspectives to a live dataset. If so is there step by step instructions or a place I can learn more about the process?

[Yuvarajand]

Noob question. Is it possible to connect to a thin report opened in desktop and add new measures via TE3? 

[amitchandak]

@Akircher , If your tabular editor 2 is properly installed, you should be able to open the same using external tools in power bi desktop.

In case you want to connect to a dataset on service. You will able in case of power bi premium using XMLA end point and workspace URL

[Akircher]

How do I know if it is properly installed? It is an option in external tools and I can open it  through pwer bi.