Managing multiple @blueyonder.co.uk accounts

I have an active Virgin Media account (I'm a broadband customer), and for years have had four @blueyonder.co.uk email addresses used by myself and three other family members associated with that account. All four accounts are regularly used. After the transition to VMO2, I've linked my new VMO2 ID to my Virgin Media account. I'm able to manage my (the primary) @blueyonder.co.uk email account app password through https://www.virginmediao2.co.uk/identity/id-settings/my-accounts using ID Settings->Virgin Media Account->Manage email app password. However, I can't see any way to manage the @blueyonder.co.uk email accounts used by my other family members (e.g. to change the app password). Some of those family members have their own VMO2 IDs (because they're O2 mobile customers), but unless I'm wrong it doesn't seem possible to link those IDs to the single common household Virgin Media account which I manage, and hence there seems no way for those members to manage their own @blueyonder.co.uk app password.

Help! Surely there must be a way to do this.