Talktalk blocking Microsoft verification code emails

[hod68]

Hi, I have experienced the exact same issue as others with receiving a one time passcode from MicrosoftOffice365@messaging.microsoft.com. Despite requesting numerous times and being told it has been sent no code arrives to my email account on talktalk. What is the issue and how can I get it resolved as I have an important encrypted message that I need to be able to access. 

[Ady-TalkTalk]

Hi hod68, the 7 day scan that we can run to check for blocked, rejected or deferred mail isn't showing anything. I need to have a chat with our security team as there are a few sites blocked this weekend suggesting they've had to intercede due to spam issues.

Ady