PSBT Not Signing via HWI – `0x5515` Error from `bitcoininsotype.signpsbt:4`

I'm trying to sign a valid PSBT using HWI with a hardware wallet (Ledger), but I'm getting an error during signing:

HWIError: 0x5515 error in bitcoininsotype.signpsbt:4

🔧 Setup:

• Network: regtest

• Hardware wallet: Ledger Nano S Plus

• Descriptor used (watch-only wallet imported to Bitcoin Core):

  tr([<fingerprint>/86h/1h/0h]tpub.../0/*)
  

• UTXO:

  {
    "desc": "tr([fingerprint/86h/1h/0h/0/0]pubkey)#checksum",
    "amount": 1.0,
    ...
  }
  

• PSBT creation (using bitcoin-cli):

  bitcoin-cli -regtest -rpcwallet=tapwatch walletcreatefundedpsbt \
  "[{ \"txid\": \"...\", \"vout\": 0 }]" \
  "[{ \"bcrt1...\": 0.00099 }]" \
  0 '{ "includeWatching": true, "replaceable": false, "subtractFeeFromOutputs": [0] }'
  

• Signing command:

  hwi --device-type ledger --fingerprint <FPR> signpsbt <base64_psbt>
  

❌ Problem:

HWI throws this error:

0x5515 error in bitcoininsotype.signpsbt:4

• PSBT inputs are Taproot (Bech32m).

• Wallet was created via:

  createwallet "tapwatch" true true "" true
  

• Descriptor imported using importdescriptors.

✅ Tried:

• Verified descriptor and derivation paths.
• Funded address matches the descriptor.
• Ledger is on latest firmware.
• Ledger Live is not running (to avoid interference).
• Attempted multiple derivation paths: m/86h/1h/0h/0/0 and m/86h/1h/0h/0/1.

---

🧠 Questions:

1. What does the 0x5515 error code indicate?
2. Is it possible that HWI/Bitcoin Core is producing an invalid or incomplete PSBT for Ledger?
3. Are there specific limitations with Ledger regarding Taproot + HWI signing (e.g., script type, derivation path)?
4. How can I fix or debug this issue?

Any insight into what this error means or how to resolve it would be appreciated.

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