Use Master User for auto login to Power Bi Embedded (for customers) in Xamarin Forms app

[Anonymous]

Good day to all of you. I have a problem with probably not fully understanding how to embed PBI report in my Xamarin app. 
I got my token and I used Master User for this, but when I put my EmbedUrl in Source proprety of WebView, i get a message: "Please sing in to view this report". This is a problem because my customers don't have PowerBi account and I want them to be able to see this report. Problem might be in my headers I use to get token, so below is code I use

string url = "https://login.microsoftonline.com/" + tennant_id + "/oauth2/token"; //url to which I POST to

IEnumerable<KeyValuePair<string, string>> parameters = new List<KeyValuePair<string, string>>()
{
new KeyValuePair<string, string>("authenticationType", "MasterUser"),
new KeyValuePair<string, string>("name", "<name>"),
new KeyValuePair<string, string>("workspaceId", "<workspaceId>"),
new KeyValuePair<string, string>("grant_type", "password"),
new KeyValuePair<string, string>("scope", "https://analysis.windows.net/powerbi/api/.default"),
new KeyValuePair<string, string>("resource", "https://analysis.windows.net/powerbi/api"),
new KeyValuePair<string, string>("authorityUrl", "https://login.microsoftonline.com/organizations/"),
new KeyValuePair<string, string>("urlPowerBiServiceApiRoot", "https://api.powerbi.com/"),
new KeyValuePair<string, string>("client_id", "<clientID>"),
new KeyValuePair<string, string>("username", "<username>"),
new KeyValuePair<string, string>("password", "<password>"),
new KeyValuePair<string, string>("client_secret", "<clientSecret>")
};

 After I get access token, I use it in GET request to 

https://api.powerbi.com/v1.0/myorg/reports/<report_it>

 and I pass AuthenticationHeader as 

client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", accessToken);

Then I get my embed url which I use in WebView Source property but I am not logged in. When I do login i see this report, but otherwise I can't. Where am I making a mistake/mistakes? 

[Anonymous · Accepted solution]

Hello all, I found solution to this, so if anyone else is stuck you can check out link on stack overflow where I also posted this error: link 
It is listed as answer 

[V-lianl-msft]

Hi @Anonymous ,

You could refer to this sample.

https://github.com/brminnick/PowerBISampleApp 

Best Regards,
Liang
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

[Anonymous]

hello and thanks for answering. That app is really confusing for me because I am begginer and I have no idea where anything goes in that app, and there is so little documentation for it. I will post my solution, but thatnks for help, maybe someone else will find it useful