Only the previous version of the Passport device, the Foundation Passport V1, is currently compatible with Casa. The newest version, the Passport (Batch 2), is currently not compatible with Casa.
The compatible device is unfortunately no longer for sale on the Foundation website (they only sell the newest model). Until Casa offers full support for the new device, you should not purchase the new device with the goal of using it for your Casa vault.
Additionally, the Passport V1 can only be used with BTC vaults. ETH vaults are not supported.
Foundation Passport V1