I have been using this now in preference to LastPass. The authenticator works well on my iphone and edge is working well on my PC. I have an 11 year Macbook too and I tested it with that and edge works fine.
Now there are some issues. Some websites seem to not have username + password. They get the username and then prompt for password after it gets the username. Edge gets confused by this. It would be nice if you could do manual copy/paste. Creating a secure password would be a nice trick too. Just stops password re-use and would be a nice feature. If it's there it isn't obvious. I do have some places where I have more than one username. One for personal and one as part of my work. I would like an easy way to annotate the entry so it shows which I am using.
I switch to an android device occasionally. It's a shame that IOS authenticator backs up to icloud and android backs up to Google Drive. The two authenticators don't seem to have interoperablity on 2FA with your Microsoft id. For my usage case it would be good.
Generally I like the direction of password security. The trust in technology companies over privacy and security has been low. I think if Microsoft got a positive reputation for password management that was easy to use for most people it would be good news.