I've been in touch with apple support over the past few weeks about this issue, and they don't seem to have a clear take on what's causing it or how to solve it.
I have a MacBook Air with Intel hardware and their latest suggestion was to reset the NVRAM (if I sound like I know what I'm talking about, I don't -- I'm just repeating the instructions they gave me 😂.) I've just done that, and I am waiting to see if it helps, but based on how many people appear to be dealing with this issue, I'm guessing it may not.
Meantime, in poking around online, I discovered this possible fix:
https://community.jamf.com/t5/jamf-pro/required-managed-update-daily-notification/td-p/276476
I posted it a week or so ago in another thread on this same subject, asking if anyone with some familiarity with apple code might weigh in on whether or not it makes sense and is safe to try.
No one there piped up, but if anyone here has some expertise and might offer insight -- that would be great!
"Required managed update notification" - Apple Community