diff --git a/src/ripple/app/tx/impl/MPTokenAuthorize.cpp b/src/ripple/app/tx/impl/MPTokenAuthorize.cpp
index 86821266328..96d2c136ae7 100644
--- a/src/ripple/app/tx/impl/MPTokenAuthorize.cpp
+++ b/src/ripple/app/tx/impl/MPTokenAuthorize.cpp
@@ -87,7 +87,7 @@ MPTokenAuthorize::preclaim(PreclaimContext const& ctx)
             return tecOBJECT_NOT_FOUND;
 
         if (accountID == (*sleMptIssuance)[sfIssuer])
-            return temMALFORMED;
+            return tecNO_PERMISSION;
 
         // if holder wants to use and create a mpt
         if (sleMpt)
@@ -111,7 +111,7 @@ MPTokenAuthorize::preclaim(PreclaimContext const& ctx)
     // Note: `accountID` is issuer's account
     //       `holderID` is holder's account
     if (accountID != (*sleMptIssuance)[sfIssuer])
-        return temMALFORMED;
+        return tecNO_PERMISSION;
 
     // If tx is submitted by issuer, it only applies for MPT with
     // lsfMPTRequireAuth set
diff --git a/src/ripple/protocol/Indexes.h b/src/ripple/protocol/Indexes.h
index db3caf504ff..e4d2aa1a34d 100644
--- a/src/ripple/protocol/Indexes.h
+++ b/src/ripple/protocol/Indexes.h
@@ -312,12 +312,6 @@ mptoken(uint256 const& mptokenKey)
 
 Keylet
 mptoken(uint256 const& issuanceKey, AccountID const& holder) noexcept;
-
-Keylet
-mpt_dir(uint192 const& id) noexcept;
-
-Keylet
-mpt_dir(uint256 const& id) noexcept;
 }  // namespace keylet
 
 // Everything below is deprecated and should be removed in favor of keylets:
diff --git a/src/ripple/protocol/impl/Indexes.cpp b/src/ripple/protocol/impl/Indexes.cpp
index 020f9c9bf27..a2c57c56d5d 100644
--- a/src/ripple/protocol/impl/Indexes.cpp
+++ b/src/ripple/protocol/impl/Indexes.cpp
@@ -74,7 +74,6 @@ enum class LedgerNameSpace : std::uint16_t {
     DID = 'I',
     MPTOKEN_ISSUANCE = '~',
     MPTOKEN = 't',
-    MPT_DIR = 'k',
 
     // No longer used or supported. Left here to reserve the space
     // to avoid accidental reuse.
@@ -495,19 +494,6 @@ mptoken(uint256 const& issuanceKey, AccountID const& holder) noexcept
     return {
         ltMPTOKEN, indexHash(LedgerNameSpace::MPTOKEN, issuanceKey, holder)};
 }
-
-Keylet
-mpt_dir(uint192 const& id) noexcept
-{
-    return {
-        ltDIR_NODE, indexHash(LedgerNameSpace::MPT_DIR, mptIssuance(id).key)};
-}
-
-Keylet
-mpt_dir(uint256 const& id) noexcept
-{
-    return {ltDIR_NODE, indexHash(LedgerNameSpace::MPT_DIR, id)};
-}
 }  // namespace keylet
 
 }  // namespace ripple
diff --git a/src/test/app/MPToken_test.cpp b/src/test/app/MPToken_test.cpp
index d2a1d1e5e55..ad814a1fd61 100644
--- a/src/test/app/MPToken_test.cpp
+++ b/src/test/app/MPToken_test.cpp
@@ -245,16 +245,10 @@ class MPToken_test : public beast::unit_test::suite
 
             // bob submits a tx with a holder field
             mptAlice.authorize(
-                {.account = &bob, .holder = &alice, .err = temMALFORMED});
-
-            mptAlice.authorize(
-                {.account = &bob, .holder = &bob, .err = temMALFORMED});
+                {.account = &bob, .holder = &alice, .err = tecNO_PERMISSION});
 
             // alice tries to hold onto her own token
-            mptAlice.authorize({.account = &alice, .err = temMALFORMED});
-
-            // alice tries to authorize herself
-            mptAlice.authorize({.holder = &alice, .err = temMALFORMED});
+            mptAlice.authorize({.account = &alice, .err = tecNO_PERMISSION});
 
             // the mpt does not enable allowlisting
             mptAlice.authorize({.holder = &bob, .err = tecNO_AUTH});
@@ -302,7 +296,7 @@ class MPToken_test : public beast::unit_test::suite
             mptAlice.create({.ownerCount = 1, .flags = tfMPTRequireAuth});
 
             // alice submits a tx without specifying a holder's account
-            mptAlice.authorize({.err = temMALFORMED});
+            mptAlice.authorize({.err = tecNO_PERMISSION});
 
             // alice submits a tx to authorize a holder that hasn't created
             // a mptoken yet