diff --git a/connectors/src/connectors/slack/index.ts b/connectors/src/connectors/slack/index.ts
index 300d35f3b5a2..dbbfdd9884c9 100644
--- a/connectors/src/connectors/slack/index.ts
+++ b/connectors/src/connectors/slack/index.ts
@@ -28,8 +28,7 @@ import { ConnectorResource } from "@connectors/resources/connector_resource";
 import { SlackConfigurationResource } from "@connectors/resources/slack_configuration_resource";
 import type { DataSourceConfig } from "@connectors/types/data_source_config.js";
 
-const { NANGO_SLACK_CONNECTOR_ID, SLACK_CLIENT_ID, SLACK_CLIENT_SECRET } =
-  process.env;
+const { SLACK_CLIENT_ID, SLACK_CLIENT_SECRET } = process.env;
 
 export class SlackConnectorManager extends BaseConnectorManager<SlackConfigurationType> {
   static async create({
@@ -88,10 +87,6 @@ export class SlackConnectorManager extends BaseConnectorManager<SlackConfigurati
   }: {
     connectionId?: string | null;
   }): Promise<Result<string, ConnectorsAPIError>> {
-    if (!NANGO_SLACK_CONNECTOR_ID) {
-      throw new Error("NANGO_SLACK_CONNECTOR_ID not set");
-    }
-
     const c = await ConnectorResource.fetchById(this.connectorId);
     if (!c) {
       logger.error({ connectorId: this.connectorId }, "Connector not found");
@@ -719,9 +714,6 @@ export class SlackConnectorManager extends BaseConnectorManager<SlackConfigurati
 }
 
 export async function uninstallSlack(connectionId: string) {
-  if (!NANGO_SLACK_CONNECTOR_ID) {
-    throw new Error("NANGO_SLACK_CONNECTOR_ID is not defined");
-  }
   if (!SLACK_CLIENT_ID) {
     throw new Error("SLACK_CLIENT_ID is not defined");
   }
diff --git a/connectors/src/connectors/slack/lib/slack_client.ts b/connectors/src/connectors/slack/lib/slack_client.ts
index e6276628f278..58ebf6ee8dcf 100644
--- a/connectors/src/connectors/slack/lib/slack_client.ts
+++ b/connectors/src/connectors/slack/lib/slack_client.ts
@@ -7,16 +7,13 @@ import type {
 } from "@slack/web-api";
 import { ErrorCode, WebClient } from "@slack/web-api";
 
+import { apiConfig } from "@connectors/lib/api/config";
 import {
   ExternalOauthTokenError,
   ProviderWorkflowError,
 } from "@connectors/lib/error";
-import { getAccessTokenFromNango } from "@connectors/lib/nango_helpers";
-import { isDualUseOAuthConnectionId } from "@connectors/lib/oauth";
-import { ConnectorResource } from "@connectors/resources/connector_resource";
-const { NANGO_SLACK_CONNECTOR_ID } = process.env;
-import { apiConfig } from "@connectors/lib/api/config";
 import logger from "@connectors/logger/logger";
+import { ConnectorResource } from "@connectors/resources/connector_resource";
 
 // Timeout in ms for all network requests;
 const SLACK_NETWORK_TIMEOUT_MS = 30000;
@@ -186,31 +183,19 @@ export async function getSlackConversationInfo(
 export async function getSlackAccessToken(
   connectionId: string
 ): Promise<string> {
-  if (isDualUseOAuthConnectionId(connectionId)) {
-    const tokRes = await getOAuthConnectionAccessToken({
-      config: apiConfig.getOAuthAPIConfig(),
-      logger,
-      provider: "slack",
-      connectionId,
-    });
-    if (tokRes.isErr()) {
-      logger.error(
-        { connectionId, error: tokRes.error },
-        "Error retrieving Slack access token"
-      );
-      throw new Error("Error retrieving Slack access token");
-    }
-
-    return tokRes.value.access_token;
-  } else {
-    // TODO(spolu) SLACK_MIGRATION remove once migrated
-    if (!NANGO_SLACK_CONNECTOR_ID) {
-      throw new Error("NANGO_SLACK_CONNECTOR_ID is not defined");
-    }
-    return getAccessTokenFromNango({
-      connectionId: connectionId,
-      integrationId: NANGO_SLACK_CONNECTOR_ID,
-      useCache: true,
-    });
+  const tokRes = await getOAuthConnectionAccessToken({
+    config: apiConfig.getOAuthAPIConfig(),
+    logger,
+    provider: "slack",
+    connectionId,
+  });
+  if (tokRes.isErr()) {
+    logger.error(
+      { connectionId, error: tokRes.error },
+      "Error retrieving Slack access token"
+    );
+    throw new Error("Error retrieving Slack access token");
   }
+
+  return tokRes.value.access_token;
 }