Sending, receiving, and organizing email in Outlook.com
Hello,
Check your Junk or SPAM email folders and see whether the verification code emails have ended up there.
Alternatively, please add the sender's address/domain to the safe sender list. To do that,
-Sign in with your Microsoft account using the link below.
https://outlook.live.com/mail/0/junkemail
Check the blocked sender list first.
If you see the email address that you want to receive emails from in the lists, remove the address there and add it to the safe sender's list.
Also, use a private browsing tab and try requesting the verification code on the website you're trying to sign in to. See if you receive it on Outlook email.