Mail App reads "Forbidden" and won't allow access
To preface, I have recently had difficulties with hackers getting into my ntlworld email account. Following security advice, I have: Signed out of all devices. Changed my password (from a confirmed non-compromised device, just in case), then removed the password in favour of the more secure passkey. Changed my login email to a third party email address. I've also been monitoring the Activity Log for sign ins and not seen any new ones I don't recognise. While I still have access to my Virgin Media O2 account login, when I go to my Mail app page, I am now receiving a "Forbidden" page. I am assuming it's been locked for security reasons. I have seen in other threads that the third party email often fixes this, but I can't see any other way of unlocking this. Can anyone assist?