I tried that also. Both my accounts are linked to each other. At that time, I couldn't go into the single account I had at all. I did delete (uninstall) the security upgrade, as you suggested and immediately it deemed my computer, unavailable. I didn't say I made a new Microsoft account. It is a local account used to sign in. Anyway, my Google is working well for me, so I still leave all my passwords there and save them to WORD also.,
Hope everyone finds a work around until Microsoft fixes this mess.
I am signing out off this discussion now. Hope what we have discussed has helped others. Thanks Jerseygirl!
Hope the Covid19 takes a trip to eternity and leaves us all alone.