If you had posted this in any of the broadband, fibre or full fibre boards, you would have hopefully seen my sticky on this. Never mind, here it is:-
https://community.talktalk.co.uk/t5/Broadband/Weak-Security-warning-on-Apple-iOS-and-Windows-10-or-1...
The TalkTalk Community has now moved to a peer-to-peer support model. This means that the TalkTalk team will no longer be here to support with queries. Don’t worry, there are plenty of ways to reach out if you need to speak to TalkTalk directly. For more details check out the link here
How to contact TalkTalk Broadband - TalkTalk Help & Support