Yes I tried that thanks. The problem is that even for testnet, the software asks you to enter the xpub or connect the hw, it doesn't generate the xpub. What I need is precisely the xpub, but I can't find where to generate it (an xpub compatible to taproot, and for testnet) electrum wallets xpubs are rejected by mycitadel, as well as the xpubs by the ian coleman site