Currently my BT router blocks access to various miscellaneous sites even though parental control is off. One example is the Huawei connectivity checker on my phone which is required to successfully connect for a logon to take place when adding a new WiFi network.
The issue I'm having is that currently, parental control is OFF. When I try and turn it ON from My BT's Security page to manage the settings and find the issue it throws a server error:
Server error please try again
Parental controls are set at a network level so it should not make any difference replacing or resetting your hub.
As you would appear to getting nowhere with the Customer Service I have notified the moderators of the forum about your problem. Once they have read this they may be able to help. They are very busy at present so it can take up to 48 hours for them to contact you. They will do this by posting on this thread.
I'll be interested to see if a factory reset of your hub will resolve the problem particularly when you have already replaced the hub, which in effect was like doing a factory reset and it resulted in the problem still being there so please update the thread when you have done that.