Unable to generate address after importing Taproot Multisig descriptor

There are three wallets to use to create a Taproot Multisig wallet. All of my work is based on this https://github.com/bitcoin/bitcoin/blob/master/doc/multisig-tutorial.md. The external and internal Xpubs for each are as follows:

Wallet 1 (External + Internal Xpubs)

(11776e3b/86h/1h/0h)tpubDCTp9moNmiVHK9KS6j6HEyU9duvomZrE87wTNQMkcZktDu89f3yJFATEQovpsT8KwUDWhut5YYd3zNsUYuv6sGHLozsub1AHPoyL7uGW2LT/0/*
(11776e3b/86h/1h/0h)tpubDCTp9moNmiVHK9KS6j6HEyU9duvomZrE87wTNQMkcZktDu89f3yJFATEQovpsT8KwUDWhut5YYd3zNsUYuv6sGHLozsub1AHPoyL7uGW2LT/1/*

Wallet 2 (External + Internal Xpubs)

(fe5187e5/86h/1h/0h)tpubDCqr5GVKeptzMG5QKLu1aQKXFXgF6kMy9dYDQ6Nap6emZ3iziMCeVX1pPjEzA7nTmyZS9NP2KjUsGtEs8jNqFcUTpKxAwXPB3yfbee4RthM/0/*
(fe5187e5/86h/1h/0h)tpubDCqr5GVKeptzMG5QKLu1aQKXFXgF6kMy9dYDQ6Nap6emZ3iziMCeVX1pPjEzA7nTmyZS9NP2KjUsGtEs8jNqFcUTpKxAwXPB3yfbee4RthM/1/*

Wallet 3 (External + Internal Xpubs)

(9f5cbc68/86h/1h/0h)tpubDDQbi15GQjXYxhAysxdEC6VsSFacJ6hgDAJ7oQy4wUs9sfwMQWtcLqLx7GUbBfWyVwUYMEEJtWmxFXmpmjQL8X4cRdgAJ7BcaazuCYq4iCp/0/*
(9f5cbc68/86h/1h/0h)tpubDDQbi15GQjXYxhAysxdEC6VsSFacJ6hgDAJ7oQy4wUs9sfwMQWtcLqLx7GUbBfWyVwUYMEEJtWmxFXmpmjQL8X4cRdgAJ7BcaazuCYq4iCp/1/*

Here is my descriptor:

external_desc="tr(tpubDCTp9moNmiVHK9KS6j6HEyU9duvomZrE87wTNQMkcZktDu89f3yJFATEQovpsT8KwUDWhut5YYd3zNsUYuv6sGHLozsub1AHPoyL7uGW2LT/1/*,sortedmulti_a(2,tpubDCTp9moNmiVHK9KS6j6HEyU9duvomZrE87wTNQMkcZktDu89f3yJFATEQovpsT8KwUDWhut5YYd3zNsUYuv6sGHLozsub1AHPoyL7uGW2LT/0/*,tpubDCqr5GVKeptzMG5QKLu1aQKXFXgF6kMy9dYDQ6Nap6emZ3iziMCeVX1pPjEzA7nTmyZS9NP2KjUsGtEs8jNqFcUTpKxAwXPB3yfbee4RthM/0/*,tpubDDQbi15GQjXYxhAysxdEC6VsSFacJ6hgDAJ7oQy4wUs9sfwMQWtcLqLx7GUbBfWyVwUYMEEJtWmxFXmpmjQL8X4cRdgAJ7BcaazuCYq4iCp/0/*))#546p4cqh"

For the first discussion of tr Uses and uses the internal Xpub of wallet 1 sortedmulti_a To configure 2-3 using an external one. I’ll call getdescriptorinfo Instructions:

 ./build/src/bitcoin-cli -signet getdescriptorinfo $external_desc
{
  "descriptor": "tr(tpubDCTp9moNmiVHK9KS6j6HEyU9duvomZrE87wTNQMkcZktDu89f3yJFATEQovpsT8KwUDWhut5YYd3zNsUYuv6sGHLozsub1AHPoyL7uGW2LT/1/*,sortedmulti_a(2,tpubDCTp9moNmiVHK9KS6j6HEyU9duvomZrE87wTNQMkcZktDu89f3yJFATEQovpsT8KwUDWhut5YYd3zNsUYuv6sGHLozsub1AHPoyL7uGW2LT/0/*,tpubDCqr5GVKeptzMG5QKLu1aQKXFXgF6kMy9dYDQ6Nap6emZ3iziMCeVX1pPjEzA7nTmyZS9NP2KjUsGtEs8jNqFcUTpKxAwXPB3yfbee4RthM/0/*,tpubDDQbi15GQjXYxhAysxdEC6VsSFacJ6hgDAJ7oQy4wUs9sfwMQWtcLqLx7GUbBfWyVwUYMEEJtWmxFXmpmjQL8X4cRdgAJ7BcaazuCYq4iCp/0/*))#546p4cqh",
  "checksum": "546p4cqh",
  "isrange": true,
  "issolvable": true,
  "hasprivatekeys": false
}

It then uses that descriptor to construct the descriptor that is used to import JSON into your wallet. This is what I used to create the JSON:

external_desc_sum=$(./build/src/bitcoin-cli -signet getdescriptorinfo $external_desc | jq '.descriptor')
multisig_ext_desc="({\"desc\": $external_desc_sum, \"timestamp\": \"now\"})"

After that I call it importdescriptors New blank wallet way:

./build/src/bitcoin-cli -signet -named createwallet wallet_name="multi_tr" disable_private_keys=true blank=true
./build/src/bitcoin-cli -signet -rpcwallet="multi_tr" importdescriptors "$multisig_ext_desc"
./build/src/bitcoin-cli -signet -rpcwallet="multi_tr" getwalletinfo

The following is the response for the import descriptor:

{
  "name": "multi_tr"
}
(
  {
    "success": true,
    "warnings": (
      "Range not given, using default keypool range"
    )
  }
)

The output from Get Wallet Info is as follows:

{
  "walletname": "multi_tr",
  "walletversion": 169900,
  "format": "sqlite",
  "balance": 0.00000000,
  "unconfirmed_balance": 0.00000000,
  "immature_balance": 0.00000000,
  "txcount": 0,
  "keypoolsize": 0,
  "keypoolsize_hd_internal": 0,
  "paytxfee": 0.00000000,
  "private_keys_enabled": false,
  "avoid_reuse": false,
  "scanning": false,
  "descriptors": true,
  "external_signer": false,
  "blank": true,
  "birthtime": 1739107662,
  "lastprocessedblock": {
    "hash": "0000005ba71046c3e13011955cf5a65c09fc7e945030a3d623dbfef8e7b3dce6",
    "height": 234655
  }
}

After seeing this output I was excited and wanted to generate a new address to fund a multi-sig wallet, but I got an error.

./build/src/bitcoin-cli  -signet -rpcwallet="multi_tr" getnewaddress
error code: -4
error message:
Error: This wallet has no available keys

After searching for a replacement I found it deriveaddresses The method worked in my use case and was able to get some addresses.

./build/src/bitcoin-cli  -signet deriveaddresses "tr(tpubDCTp9moNmiVHK9KS6j6HEyU9duvomZrE87wTNQMkcZktDu89f3yJFATEQovpsT8KwUDWhut5YYd3zNsUYuv6sGHLozsub1AHPoyL7uGW2LT/1/*,sortedmulti_a(2,tpubDCTp9moNmiVHK9KS6j6HEyU9duvomZrE87wTNQMkcZktDu89f3yJFATEQovpsT8KwUDWhut5YYd3zNsUYuv6sGHLozsub1AHPoyL7uGW2LT/0/*,tpubDCqr5GVKeptzMG5QKLu1aQKXFXgF6kMy9dYDQ6Nap6emZ3iziMCeVX1pPjEzA7nTmyZS9NP2KjUsGtEs8jNqFcUTpKxAwXPB3yfbee4RthM/0/*,tpubDDQbi15GQjXYxhAysxdEC6VsSFacJ6hgDAJ7oQy4wUs9sfwMQWtcLqLx7GUbBfWyVwUYMEEJtWmxFXmpmjQL8X4cRdgAJ7BcaazuCYq4iCp/0/*))#546p4cqh" "(0,2)"
(
  "tb1pg0p5p2vfqn3stjrrz0ga33m4wudcxmsl4qsuv4csnq5lxfnws3zss5xcvh",
  "tb1p4z6n9hlt2rs9arlaxwkcgpp79803rmle6wty946zwce74u4wnmas4r8etx",
  "tb1pk3nj9xt2aempeys63etmw3zfkj8pya0sr2lcl2spf6xqtjev8zfqkfzg5p"
)

My question is:

• Why the first way generatenewaddress Is it not working?
• is deriveaddresses What is the recommended method for general use? If so, I think you need to save the range of use to generate a new address each time (as using the same range will generate the same address). So if you use the range (0,0), you must use the next time (1,1).

thank you