Potential massive security breach. Already recently changed all my PW.

When i logged onto my personal desktop computer today i was greeted with Micrsoft one drive saying i need to prove who i am and use my password. I went to enter my password that i had already changed less than 2 weeks ago after kicking someone out of my authenticator. The recovery email it says that i can use starts with 2 letters that i do not have any email with on outlook.

I tried to use my Microsoft authenticator app to check this and log in. It says my pin is wrong. Someone already has access to my freaking authenticator less than 2 weeks after i changed everything? are you kidding me.

i've tried googling answers for help and all i found was this thread.
https://www.reddit.com/r/Outlook/comments/1m4wp7h/comment/n86zydp/?context=3

I've already used multiple different scans to look for any form of virus/malware/keyloggers on my computer.

on further review it appears that someone had access to my gmail account at a point when i was trying to re-establish control of my account.