hi psyang
You may try these way to get PbiServiceModelId
a. Create another PowerBI report referencing the dataset you want the ID of, save it, extract it, and look in the Connections file
b. Use the PowerBI REST API (eg. Get Dataset By ID in Group in my case) - note that this requires authentication, as your browser isn't authenticated on api.powerbi.com
c. Using Chrome or any other developer-friendly browser, open the report list, the Developer Tools, and look in the network responses (in particular, a response from https://*.analysis.windows.net/powerbi/metadata/app), and check the models property for a list of your available datasets in your current workspace.
and to get faster and better technical support for this issue, you may directly create a support ticket.
Regards,
Lin