Hey, nwc.getalby.com doesn't support subaccounts, only 'regular' NWC Connection.

Subaccount is a 'isolated' type of NWC Connection, that you can generate in Alby Hub's Connections or through Friends&Family app in its App Store.

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You need to generate NWC Connection Secret (QR code and/or nostr+walletconnect.... string) and scan it with your Alby Go, when you add new wallet there.

Moreover, you can reuse that Secret and link it to brand new getalby Account, so that subaccount will also get their own Lightning Address!