That happened to some of my windows 10 installs too. People complained about getting nagged and I thought they were being dramatic.

Then windows decided it was my turn to be nagged and OH MAN I understood ...

I have no good answer for exactly how that situation plays out. I swear it's not a local device setting.

On my laptop, it doesn't nag me, but it does nag my son sometimes when he logs in. My son is not admin, so I don't know why Windows bothers non-admins with this.

At least I hope non-admins can't upgrade, but knowing MS, maybe they can.

That happened to me as well. I get told in the windows update dialog thing to check if I am windows 11 compatible, which I pass but I still don't get Windows 11 offered.