Oh, right, I forgot that thing Windows 10 did the last time it upgraded, where it kept constantly telling me I had to re-enter my "most recent credential" for my Microsoft account. I'm trying to remember how I dealt with that last time. I think, after trying everything the internet told me to try, I just finally told Windows to ignore the message. Oh, Windows.
In other news, I now have an estimate for my concrete work, and I'm possibly more surprised than I should be by just how close it is to my own rough guesstimate for how much this was gonna cost me.