You'll need to log on to both accounts in Oullook.com and go through the settings in each account. Either turn off 2 step log on or put in your cell phone so they can text you a number to input. At this time you may need tech support help to get back into your actual accounts where you can fix the settings.
We have had two major upgrades to Microsoft mail whichever version there all the same. First, they moved everything to an Exchange server, that created many changes that have to have settings set up. then in the last couple of months, they have changed the GUI, again with many settings you have to look and decide about. Both of these upgrades trashed all our Rules so they all have to be set up again. To the good, setting up rules are now quite easy to accomplish