diff --git a/source/transactions-convenient-api/tests/callback-retry.json b/source/transactions-convenient-api/tests/callback-retry.json
index 2275441d68..147ce858b3 100644
--- a/source/transactions-convenient-api/tests/callback-retry.json
+++ b/source/transactions-convenient-api/tests/callback-retry.json
@@ -207,7 +207,6 @@
                     }
                   },
                   "result": {
-                    "errorCodeName": "DuplicateKey",
                     "errorLabelsOmit": [
                       "TransientTransactionError",
                       "UnknownTransactionCommitResult"
@@ -218,7 +217,6 @@
             }
           },
           "result": {
-            "errorCodeName": "DuplicateKey",
             "errorLabelsOmit": [
               "TransientTransactionError",
               "UnknownTransactionCommitResult"
diff --git a/source/transactions-convenient-api/tests/callback-retry.yml b/source/transactions-convenient-api/tests/callback-retry.yml
index 1291dabf46..a71898460e 100644
--- a/source/transactions-convenient-api/tests/callback-retry.yml
+++ b/source/transactions-convenient-api/tests/callback-retry.yml
@@ -149,10 +149,11 @@ tests:
                   session: session0
                   document: { _id: 1 }
                 result:
-                  errorCodeName: DuplicateKey
                   errorLabelsOmit: ["TransientTransactionError", "UnknownTransactionCommitResult"]
         result:
-          errorCodeName: DuplicateKey
+          # Don't assert on errorCodeName because (after SERVER-38583) the
+          # DuplicateKey is reported in writeErrors, not as a top-level
+          # command error.
           errorLabelsOmit: ["TransientTransactionError", "UnknownTransactionCommitResult"]
     expectations:
       -
diff --git a/source/transactions/tests/abort.json b/source/transactions/tests/abort.json
index 084429b7a9..87e64176f4 100644
--- a/source/transactions/tests/abort.json
+++ b/source/transactions/tests/abort.json
@@ -441,7 +441,6 @@
             }
           },
           "result": {
-            "errorCodeName": "DuplicateKey",
             "errorLabelsOmit": [
               "TransientTransactionError",
               "UnknownTransactionCommitResult"
diff --git a/source/transactions/tests/abort.yml b/source/transactions/tests/abort.yml
index f1bbca7630..e18a3ef178 100644
--- a/source/transactions/tests/abort.yml
+++ b/source/transactions/tests/abort.yml
@@ -297,7 +297,9 @@ tests:
           document:
             _id: 1
         result:
-          errorCodeName: DuplicateKey
+          # Don't assert on errorCodeName because (after SERVER-38583) the
+          # DuplicateKey is reported in writeErrors, not as a top-level
+          # command error.
           errorLabelsOmit: ["TransientTransactionError", "UnknownTransactionCommitResult"]
       # Make sure the server aborted the transaction.
       - name: insertOne
diff --git a/source/transactions/tests/error-labels.json b/source/transactions/tests/error-labels.json
index d0728b7087..40d014ddbb 100644
--- a/source/transactions/tests/error-labels.json
+++ b/source/transactions/tests/error-labels.json
@@ -25,7 +25,6 @@
             ]
           },
           "result": {
-            "errorCodeName": "DuplicateKey",
             "errorLabelsOmit": [
               "TransientTransactionError",
               "UnknownTransactionCommitResult"
diff --git a/source/transactions/tests/error-labels.yml b/source/transactions/tests/error-labels.yml
index 04aff42c31..cd579de00d 100644
--- a/source/transactions/tests/error-labels.yml
+++ b/source/transactions/tests/error-labels.yml
@@ -17,7 +17,9 @@ tests:
             - _id: 1
             - _id: 1
         result:
-          errorCodeName: DuplicateKey
+          # Don't assert on errorCodeName because (after SERVER-38583) the
+          # DuplicateKey is reported in writeErrors, not as a top-level
+          # command error.
           errorLabelsOmit: ["TransientTransactionError", "UnknownTransactionCommitResult"]
       - name: abortTransaction
         object: session0