Hi ,
I'm Dyari. Thanks for reaching out. I will be happy to assist you in this regard.
In addition to the answer given by the Q&A Assist, sign into your account on the web at outlook.live.com > Go to Settings (gear icon) > Mail > Rules > Delete any rule you did not create, especially ones that look like they move messages or forward them. Some hackers create rules that look like a single character or a dot.
Also, go to Settings > Mail > Forwarding > If "Enable forwarding" is turned on, turn it off immediately and check for a random email address in the forwarding box that you do not recognize.