I always do the apple updates but not the microsoft ones . The latter are just annoying and make things harder or try to charge you for stuff that used to be free.
Nannytopsy, is your iPhone 6s or newer? Anything older doesn’t need this update.
I can only suggest if your phone does require the update that you try again, there may be a temporary glitch, but my knowledge of these things is very limited.
I read that there was a security problem with Apple iPads but, as my main computer is broken I was scared to do the update they recommended just in case anything went wrong as I’m so dependent on my iPad for everything. But DH was watching tv this morning and someone on BBC breakfast said whatever you do you must do this update now and he showed how to do it. It was really straightforward and only took 10 minutes.