Problem with the pageName of my report

Hello everyone,

Im following this tutorial: https://docs.microsoft.com/en-Us/power-bi/service-embed-secure  

To filter a specific page, the tutorial uses pageName=ReportSection2

But if I use that structure, I dont achieve any change.

After some tests, I discovered that my pageName is not a number, its: ReportSectionb7b41f9006704317731a (I call it a ID)

I wanna automatize a process using the pageName and numbers not ID.

So my question is, Why I dont have a number pageName, or how I can change the ID to the number???

Ill hope that my explanation will be enough to understand the problem, dont hesitate to write if you have doubts.

Thanks in advance