If you’ve just copied your multi-page Power BI report’s URL and pasted into the properties of a Power BI web part on a SharePoint page, you may have noticed your pages aren’t appearing as options in the Page name dropdown.
This is because the URL you copied from Power BI likely contained a specific page in the URL itself, ending in something like …/ReportSection1 (which is referring to a specific page already).
To fix this and have your pages show up as options in the dropdown, simply remove the ReportSection1 (or 2, 3, etc.) from the end of the URL in the Power BI report link box and try again.
To speed things along, I usually cut (Ctrl+X) the corrected URL, click outside the box to “reset” the web part, then paste (Ctrl+V) the corrected URL and wait for my page names to appear. This is demonstrated below.
Here’s a related video demonstrating how to embed a Power BI report on a SharePoint page including fixing the multi-page issue mentioned above.