I set up 365 fine on my laptop, imported my a out 2,000 contact files from outlook 2013, and added 6 email accounts. It all works great! But, I have tried for hours and hours to get the app for outlook setup on my Android Galaxy S21 with no success. I have followed instructions, watched videos, talked with Microsoft techs and Samsung techs. The Android app finds my Microsoft account, but doesn't connect. I gave up on it and decided to install it on my other work computer. I am able to register the 2nd computer in my Microsoft account, but no contacts show up, the 6 email accounts are present.
I then decided to go back to the Phone and tried my wife's Android Galaxy S21. I ran into the same problems as I had on my phone.