diff --git a/.github/workflows/server-node.yml b/.github/workflows/server-node.yml
index 461f20d702..772f8404c9 100644
--- a/.github/workflows/server-node.yml
+++ b/.github/workflows/server-node.yml
@@ -38,16 +38,12 @@ jobs:
       - name: Launch the test service in the background
         run: yarn contract-test-service 2>&1 &
       - name: Clone and run contract tests from feat/fdv2 branch
-        # NOTE: This is a temporary workaround to run the contract tests from the feat/fdv2 branch.
-        # The commit hash is a few commits before the HEAD of the feat/fdv2 branch. We do this because
-        # the HEAD of the feat/fdv2 branch requires the synchronizers be passed as a list which is not
-        # implemented yet. (SDK-1798)
         run: |
           mkdir -p /tmp/sdk-test-harness
           git clone https://github.com/launchdarkly/sdk-test-harness.git /tmp/sdk-test-harness
           cp ./contract-tests/testharness-suppressions-fdv2.txt /tmp/sdk-test-harness/testharness-suppressions-fdv2.txt
           cd /tmp/sdk-test-harness
-          git checkout de833af990da23a89b66c5366809b5be8c27e3f8
+          git checkout feat/fdv2
           go build -o test-harness .
           ./test-harness -url http://localhost:8000 -debug --skip-from=testharness-suppressions-fdv2.txt
         env:
diff --git a/contract-tests/src/sdkClientEntity.ts b/contract-tests/src/sdkClientEntity.ts
index 01c4d26891..2c061f05f3 100644
--- a/contract-tests/src/sdkClientEntity.ts
+++ b/contract-tests/src/sdkClientEntity.ts
@@ -14,6 +14,8 @@ import ld, {
   LDOptions,
   LDSerialExecution,
   LDUser,
+  PollingDataSourceConfiguration,
+  StreamingDataSourceConfiguration,
 } from '@launchdarkly/node-server-sdk';
 
 import BigSegmentTestStore from './BigSegmentTestStore.js';
@@ -36,7 +38,7 @@ interface SdkConfigOptions {
   };
   dataSystem?: {
     initializers?: SDKDataSystemInitializerParams[];
-    synchronizers?: SDKDataSystemSynchronizerParams;
+    synchronizers?: SDKDataSystemSynchronizerParams[];
     payloadFilter?: string;
   };
   events?: {
@@ -74,14 +76,8 @@ interface SdkConfigOptions {
 }
 
 export interface SDKDataSystemSynchronizerParams {
-  primary?: {
-    streaming?: SDKDataSourceStreamingParams;
-    polling?: SDKDataSourcePollingParams;
-  };
-  secondary?: {
-    streaming?: SDKDataSourceStreamingParams;
-    polling?: SDKDataSourcePollingParams;
-  };
+  streaming?: SDKDataSourceStreamingParams;
+  polling?: SDKDataSourcePollingParams;
 }
 
 export interface SDKDataSystemInitializerParams {
@@ -222,52 +218,54 @@ export function makeSdkConfig(options: SdkConfigOptions, tag: string): LDOptions
   }
 
   if (options.dataSystem) {
-    const dataSourceStreamingOptions: SDKDataSourceStreamingParams | undefined =
-      options.dataSystem.synchronizers?.primary?.streaming ??
-      options.dataSystem.synchronizers?.secondary?.streaming;
-    const dataSourcePollingOptions: SDKDataSourcePollingParams | undefined =
-      options.dataSystem.initializers?.[0]?.polling ??
-      options.dataSystem.synchronizers?.primary?.polling ??
-      options.dataSystem.synchronizers?.secondary?.polling;
-
-    if (dataSourceStreamingOptions) {
-      cf.streamUri = dataSourceStreamingOptions.baseUri;
-      cf.streamInitialReconnectDelay = maybeTime(dataSourceStreamingOptions.initialRetryDelayMs);
-    }
-    if (dataSourcePollingOptions) {
-      cf.stream = false;
-      cf.baseUri = dataSourcePollingOptions.baseUri;
-      cf.pollInterval = maybeTime(dataSourcePollingOptions.pollIntervalMs);
+    const dataSourceOptions: DataSourceOptions = {
+      dataSourceOptionsType: 'custom',
+      initializers: [],
+      synchronizers: [],
+    };
+
+    if (options.dataSystem.initializers) {
+      options.dataSystem.initializers.forEach((initializer) => {
+        if (initializer.polling) {
+          cf.baseUri = initializer.polling.baseUri;
+          cf.pollInterval = maybeTime(initializer.polling.pollIntervalMs);
+
+          const initializerOptions: PollingDataSourceConfiguration = {
+            type: 'polling',
+            pollInterval: maybeTime(initializer.polling.pollIntervalMs),
+          };
+
+          dataSourceOptions.initializers.push(initializerOptions);
+        }
+      });
     }
 
-    let dataSourceOptions: DataSourceOptions | undefined;
-    if (dataSourceStreamingOptions && dataSourcePollingOptions) {
-      dataSourceOptions = {
-        dataSourceOptionsType: 'standard',
-        ...(dataSourceStreamingOptions.initialRetryDelayMs != null && {
-          streamInitialReconnectDelay: maybeTime(dataSourceStreamingOptions.initialRetryDelayMs),
-        }),
-        ...(dataSourcePollingOptions.pollIntervalMs != null && {
-          pollInterval: dataSourcePollingOptions.pollIntervalMs,
-        }),
-      };
-    } else if (dataSourceStreamingOptions) {
-      dataSourceOptions = {
-        dataSourceOptionsType: 'streamingOnly',
-        ...(dataSourceStreamingOptions.initialRetryDelayMs != null && {
-          streamInitialReconnectDelay: maybeTime(dataSourceStreamingOptions.initialRetryDelayMs),
-        }),
-      };
-    } else if (dataSourcePollingOptions) {
-      dataSourceOptions = {
-        dataSourceOptionsType: 'pollingOnly',
-        ...(dataSourcePollingOptions.pollIntervalMs != null && {
-          pollInterval: dataSourcePollingOptions.pollIntervalMs,
-        }),
-      };
-    } else {
-      // No data source options were specified
-      dataSourceOptions = undefined;
+    if (options.dataSystem.synchronizers) {
+      options.dataSystem.synchronizers.forEach((synchronizer) => {
+        if (synchronizer.streaming) {
+          cf.streamUri = synchronizer.streaming.baseUri;
+
+          const synchronizerOptions: StreamingDataSourceConfiguration = {
+            type: 'streaming',
+          };
+
+          synchronizerOptions.streamInitialReconnectDelay = maybeTime(
+            synchronizer.streaming.initialRetryDelayMs,
+          );
+
+          dataSourceOptions.synchronizers.push(synchronizerOptions);
+        } else if (synchronizer.polling) {
+          cf.baseUri = synchronizer.polling.baseUri;
+          cf.pollInterval = maybeTime(synchronizer.polling.pollIntervalMs);
+
+          const synchronizerOptions: PollingDataSourceConfiguration = {
+            type: 'polling',
+            pollInterval: maybeTime(synchronizer.polling.pollIntervalMs),
+          };
+
+          dataSourceOptions.synchronizers.push(synchronizerOptions);
+        }
+      });
     }
 
     if (options.dataSystem.payloadFilter) {
diff --git a/contract-tests/testharness-suppressions-fdv2.txt b/contract-tests/testharness-suppressions-fdv2.txt
index 173fb7d30d..8215293c1f 100644
--- a/contract-tests/testharness-suppressions-fdv2.txt
+++ b/contract-tests/testharness-suppressions-fdv2.txt
@@ -5,7 +5,6 @@ streaming/requests/URL path is computed correctly/environment_filter_key="encodi
 polling/requests/URL path is computed correctly/environment_filter_key="encoding_not_necessary"/base URI has no trailing slash/GET
 polling/requests/URL path is computed correctly/environment_filter_key="encoding_not_necessary"/base URI has a trailing slash/GET
 
-streaming/fdv2/reconnection state management/initializes from polling initializer
 streaming/fdv2/reconnection state management/initializes from 2 polling initializers
 streaming/fdv2/reconnection state management/saves previously known state
 streaming/fdv2/reconnection state management/replaces previously known state
diff --git a/packages/shared/sdk-server/src/LDClientImpl.ts b/packages/shared/sdk-server/src/LDClientImpl.ts
index 97205d287b..0ea543efb9 100644
--- a/packages/shared/sdk-server/src/LDClientImpl.ts
+++ b/packages/shared/sdk-server/src/LDClientImpl.ts
@@ -437,19 +437,19 @@ function constructFDv2(
             ),
         );
       }
-
-      // This is short term handling and will be removed once FDv2 adoption is sufficient.
-      fdv1FallbackSynchronizers.push(
-        () =>
-          new PollingProcessorFDv2(
-            new Requestor(config, platform.requests, baseHeaders, '/sdk/latest-all', config.logger),
-            pollingInterval,
-            config.logger,
-            true,
-          ),
-      );
     }
 
+    // This is short term handling and will be removed once FDv2 adoption is sufficient.
+    fdv1FallbackSynchronizers.push(
+      () =>
+        new PollingProcessorFDv2(
+          new Requestor(config, platform.requests, baseHeaders, '/sdk/latest-all', config.logger),
+          config.pollInterval ?? DEFAULT_POLL_INTERVAL,
+          config.logger,
+          true,
+        ),
+    );
+
     dataSource = new CompositeDataSource(
       initializers,
       synchronizers,