Error on Scheduled Refresh using Personal Gateway

[nivek142]

Im new in using Personal Gateway. I followed This article to installed and configured the Gateway, i noticed that the UI is different from what i downloaded but still i continue to install since the UI is very simple and the article is the latest article from Power BI, after i installed it i encountered this errors
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If the sytem says the "Perosnal gateway is Online" and i don't need to provide windows credentials for windows authentication then why do i need to sign in? do you have any solution for this? im just using a simple POC here. Excel.xlsx > Power BI Desktop(Data Set) > Power BI Site

PS. there are 2 user accounts in my computer, administrator account and work account, both have administrator privilage but my workaccount has the data source but the Personal gateway use the Administrator account, so maybe here is the problem but i don't know  where i can input the desired auth account. I tried to unsintall it and noticed in the List of data sets affected screen, there no data set listed there.