If your Power Pages site is embedded with Power BI reports via the Power BI service, you can log into the Power BI portal at app.powerbi.com. Once you're there, check the version information by going to Settings and then to About Power BI at the bottom of the page.
right click on the browser - F12 - source code search for power bi i.e. (right-click the page and select Inspect, then go to the Console tab)
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