Thank you for your reply. They won't have registered their additional needs but if it is something I can do on his behalf, I will do that.
Thanks @jmarsden.
For any customer looking to register vulnerability, we recommend calling on the number listed here:
BT Vulnerability policy - Policies & reports - Responsible business | BT Plc
You can certainly give this a try on their behalf, but depending on how the account is set up we may need them on the line to complete security.
Peter