I've been unable to log into myBT for weeks on end depsite multiple calls to BT. They said it is known that some users are having an issue and this has been 'Priority 1' for them since March, but is still not resolved. Does anyone low anything about this? It is so frustrating. I need to change some Parental Controls.
Have you tried reinstalling the MyBT app?
If using a web browser have you tried clearing the browser's history and cookies?