When installing Monterey on an M1 Mac, you get an error message: "You must provide authorisation for this volume by setting it as your startup disk."
You must run the upgrade as an admin user. Temporarily providing admin credentials sometimes doesn't work. Try relaunching the installer after authorisation has been provided. Or install in recovery mode.
I usually write a blog post about once a week. The latest post can be viewed here: Avoid Microsoft: If you don't really like computers much you could make things a bit better for yourself. (posted 2024-12-04 at 12:05:50). I do podcasts too!. You can listen to my latest podcast, here: OJB's Podcast 2024-11-18 Unity Through Division: Sometimes hard decisions need to be made to make genuine progress..