Thanks v-qiuyu!
I'm sorry I forgot to mention about my other BI graph that was able to handle 109M and 1.26T data. (see first image below). Nevertheless, I tried, as you suggested, getting data from the same SSAS data source under Power Query tab in Excel, but it stopped at around 1.07M and returned an error message.(see 2nd image below)
Thanks for your support. 
