Power BI Report server - Issue with deploying power bi report

Hello v-qiuyu-msft and all 

Thanks for your help, now i could publish my PowerBI report to the PBI report server. 

for conclusion:

here is my situation 

i used SSAS tabular mode as the datasource.

i have SSRS report server and SSRS PBI report server on the same machine 

and I have a instance "A" for SSRS RS and instance "B" (PBIRS) like default install for SSRS PBI   

i configured  URL : http://server_name:80/Reports_A for SSRS report server  web portal 

      and         URL : http://serverè_name:81/Reports_PBI for SSRS PBI report server web protal. 

then  i  tried to deploy the report to the PBI report server (i could deploy all the report(and create data source on the PBIRS except the PBI report.)   

then after the suggestion of  v-qiuyu-msft   

i changed the service account from Virtual service account to admin in the PBIRS manager. 

Now i could depoy the PBI report to the PBIRS 

Thanks =>

Regards