I am facing the same issues to make edits to my profile on the iMac. Had tried the screen-time security changes previously and nothing happened. Does this take a little bit of time between the two devices iPhone and iMac to sync-up??

I have launched the iPhone Mirroing application (it came up on its own) upon downloading OS15 Beta, however it keeps saying iPhone Not supported. I am using iPhone 15 pro max and it is updated with the latest version. Any recommendations to solve the issue?