Cannot create Virtual network data gateway in power bi service

Hi All,

I have refred below article and created virtual network, private endpoint in Azure SQL server and configured network settings and configured VNet Subnet for Power Platform. 

Connecting Power BI to Azure SQL Database using Private Endpoints (datahai.co.uk)

But while creating vnet data gateway in Power bI service, for that when i click subscription dropdown i am not able to see the subscripton name and i typed manually and clicked enter but it is not taking. Can someone help me on how to create vnet in Power BI service.

Thanks in advance!