This post from 2020 is somewhat out of date and misleading (as of August 2023) - management of the AIP Scanner was migrated to the Purview portal in 2022 (MC447310) and the analytics features described here have been https://learn.microsoft.com/en-us/purview/azure-portal-migration#functionality-thats-deprecated-or-moved.
As a general observation, there is a LOT of outdated information about the AIP Scanner floating about on various Microsoft pages, full of instructions and PS snippets that don't work with the latest version... it would be great if some of it could be updated, removed or even just marked with something to indicate that it's no longer valid.
If it helps anyone else, the information https://learn.microsoft.com/en-us/purview/deploy-scanner -including the deployment steps - seems to be current enough to get things working (though some "Next Steps" links still point at 2020 content which is now invalid, so stay alert)