Unfortunately this only works with hosted 1Password (as far as I can tell), there doesn't seem to be any support for self hosted vaults. Can Roustem or anyone else from 1Password team clarify this?
This was the precise reason I switched to BitWarden 6 months ago, needed a solution where my passwords didn't leave my network.
This was the precise reason I switched to BitWarden 6 months ago, needed a solution where my passwords didn't leave my network.