The second paragraph of your directions includes "... if you're a family organizer...", implying that 1Password for families has access to this system, which would be awesome to have access and be able to use it in my homelab setup.
The only issue is when I try to select a Vault, no vaults show up for me in the search box. And this is using both Firefox and Chrome on macOS 11,4.
1Password Version: 1Password 7 Version 7.8.1 (70801003)
Extension Version: Desktop Version 220.127.116.11
OS Version: macOS 11.4
Sync Type: Not Provided