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Sorry no help, I am still stuck on 2021.4.18.3 and it does not want to update from that no matter what I try, including hard reboot, verifying MY wifi connection, reinstalling IOS app, etc.
I'm still on 8.2. You'll likely never get 8.12 and will skip it entirely for some later version. There are always tons of builds that you never get. For example, I doubt I'll get 8.3, then 8.10 and then 8.12, and then any number of other builds that come out after.