Primal uses strike.me as a custodial wallet. Meaning they old the money and have to comply with US banking and money transfer laws. You could use a wallet which is non-custodial and it’ll work. Unfortunately it’s harder to setup. Maybe nostr:npub12rv5lskctqxxs2c8rf2zlzc7xx3qpvzs3w4etgemauy9thegr43sf485vg could help you figure out cashu for a nostr wallet.