I ran into this problem previously when I purchased my Google Pixel 7. Then I was able to speak to someone at Microsoft Support. The fix was very easy. Once I explained the situation to the MS Rep we determined that a security code provided by MS was the way into Outlook's authentication process. Apparently MS has put in another security measure into the outlook software. Now mind you, this was the fix under the Old Outlook. However, it is not unreasonable to assume that security measure carried over to the New Outlook. Also, then I had and still have two accounts with MS (*****@msn.com and ********@outlook.com). I believe, but am not 100% certain that one initial security code provided by the MS Rep to allow me to authenticate both of them with BB Hub+.
My frustration now lays in the fact that I have struggled and have not been able to speak to a human being at MS at all this time around. The first time around was still very difficult, but i managed to talk to a human being. This time around I have run into road blocks that never existed the first time. This is the problem when one (or a few) company dominate an industry. The customer/user gets lost and left behind without any possibility of voicing there desire to stay current and relevant to the monopolies. I hope this thread pokes the bear to, at the very least, bring us to where we want to be with this issue first of all.
One last thing that goes without saying is that once both accounts were authenticated the passwords were changed to my liking.