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Error messages 400 and 401


Good morning, newbie here and not techy at all. I have spoken to the helplines and they cannot answer me. On two particular sites I use i am getting messages 400 and 401 so am not abl;e to access them. I have been told to disable my scam protection (which I ahve done) I have deleted my browsing and cache and still getting the messages. I spoke to a friend last night and she was able to access my accounts on her EE account so I believe it is something to do with Talk Talk. Can anyone help please