diff --git a/src/wallet/scriptpubkeyman.cpp b/src/wallet/scriptpubkeyman.cpp
--- a/src/wallet/scriptpubkeyman.cpp
+++ b/src/wallet/scriptpubkeyman.cpp
@@ -2033,7 +2033,22 @@
 DescriptorScriptPubKeyMan::SignMessage(const std::string &message,
                                        const PKHash &pkhash,
                                        std::string &str_sig) const {
-    return SigningResult::SIGNING_FAILED;
+    std::unique_ptr<FlatSigningProvider> keys =
+        GetSigningProvider(GetScriptForDestination(pkhash), true);
+    if (!keys) {
+        return SigningResult::PRIVATE_KEY_NOT_AVAILABLE;
+    }
+
+    CKeyID key_id(pkhash);
+    CKey key;
+    if (!keys->GetKey(key_id, key)) {
+        return SigningResult::PRIVATE_KEY_NOT_AVAILABLE;
+    }
+
+    if (!MessageSign(key, message, str_sig)) {
+        return SigningResult::SIGNING_FAILED;
+    }
+    return SigningResult::OK;
 }
 
 TransactionError