Hello,
Open outlook.com on the Safari web browser.
Then at the bottom click on the square icon with two lines icon in the address bar.
Then click on the three dots and click on "Request Mobile Website"
This should switch the outlook inbox to the traditional desktop view.
From there, review all these areas:
click on the three dots/lines on in the top right to launch the settings.
Then, on the Mail tab, go to Rules. Are there any rules set up here? If yes, delete them all.
Then check the conditional transfer, again, if it's there, delete it.
Then, check Forwarding and IMAP, If any items are present, delete them as well.
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If you can't find anything, go to https://account.live.com > Your info > Sign in Preferences. Make sure to check all the aliases here. If you don't recognize any there, delete it.
Then go to Security > Manage How I sign in, make sure all contact info is yours.