diff --git a/plugins/out_azure_logs_ingestion/azure_logs_ingestion.c b/plugins/out_azure_logs_ingestion/azure_logs_ingestion.c
index 3aee4ac182e..037a530402f 100644
--- a/plugins/out_azure_logs_ingestion/azure_logs_ingestion.c
+++ b/plugins/out_azure_logs_ingestion/azure_logs_ingestion.c
@@ -399,6 +399,11 @@ static struct flb_config_map config_map[] = {
      0, FLB_TRUE, offsetof(struct flb_az_li, client_secret),
      "Set the client secret of the AAD application"
     },
+    {
+     FLB_CONFIG_MAP_STR, "auth_url", (char *)NULL,
+     0, FLB_TRUE, offsetof(struct flb_az_li, auth_url_override),
+     "[Optional] Override the OAuth2 token endpoint."
+    },
     {
      FLB_CONFIG_MAP_STR, "dce_url", (char *)NULL,
      0, FLB_TRUE, offsetof(struct flb_az_li, dce_url),
diff --git a/plugins/out_azure_logs_ingestion/azure_logs_ingestion.h b/plugins/out_azure_logs_ingestion/azure_logs_ingestion.h
index f3ed3f82b74..74516b81715 100644
--- a/plugins/out_azure_logs_ingestion/azure_logs_ingestion.h
+++ b/plugins/out_azure_logs_ingestion/azure_logs_ingestion.h
@@ -57,6 +57,7 @@ struct flb_az_li {
     int compress_enabled;
 
     /* mangement auth */
+    flb_sds_t auth_url_override;
     flb_sds_t auth_url;
     struct flb_oauth2 *u_auth;
     /* mutex for acquiring tokens */
diff --git a/plugins/out_azure_logs_ingestion/azure_logs_ingestion_conf.c b/plugins/out_azure_logs_ingestion/azure_logs_ingestion_conf.c
index 1450bd26799..69aa00f2053 100644
--- a/plugins/out_azure_logs_ingestion/azure_logs_ingestion_conf.c
+++ b/plugins/out_azure_logs_ingestion/azure_logs_ingestion_conf.c
@@ -26,6 +26,60 @@
 #include "azure_logs_ingestion.h"
 #include "azure_logs_ingestion_conf.h"
 
+static int validate_auth_url_override(struct flb_output_instance *ins,
+                                      flb_sds_t auth_url_override)
+{
+    int ret;
+    int result;
+    char *protocol = NULL;
+    char *host = NULL;
+    char *port = NULL;
+    char *uri = NULL;
+
+    result = -1;
+
+    ret = flb_utils_url_split(auth_url_override, &protocol, &host, &port, &uri);
+    if (ret == -1 || protocol == NULL || host == NULL) {
+        flb_plg_error(ins, "property 'auth_url' has an invalid URL");
+        goto cleanup;
+    }
+
+    if (strcasecmp(protocol, "https") == 0) {
+        result = 0;
+        goto cleanup;
+    }
+
+    if (strcasecmp(protocol, "http") != 0) {
+        flb_plg_error(ins, "property 'auth_url' must use http or https");
+        goto cleanup;
+    }
+
+    if (strcmp(host, "localhost") == 0 || strcmp(host, "127.0.0.1") == 0) {
+        result = 0;
+        goto cleanup;
+    }
+
+    flb_plg_error(ins,
+                  "property 'auth_url' must use https or an explicit loopback "
+                  "http endpoint");
+
+cleanup:
+    if (protocol != NULL) {
+        flb_free(protocol);
+    }
+    if (host != NULL) {
+        flb_free(host);
+    }
+    if (port != NULL) {
+        flb_free(port);
+    }
+    if (uri != NULL) {
+        flb_free(uri);
+    }
+
+    return result;
+}
+
 struct flb_az_li* flb_az_li_ctx_create(struct flb_output_instance *ins,
                                         struct flb_config *config)
 {
@@ -61,7 +115,7 @@ struct flb_az_li* flb_az_li_ctx_create(struct flb_output_instance *ins,
         return NULL;
     }
     /* config: 'tenant_id' */
-    if (!ctx->tenant_id) {
+    if (!ctx->tenant_id && !ctx->auth_url_override) {
         flb_plg_error(ins, "property 'tenant_id' is not defined");
         flb_az_li_ctx_destroy(ctx);
         return NULL;
@@ -91,16 +145,32 @@ struct flb_az_li* flb_az_li_ctx_create(struct flb_output_instance *ins,
         return NULL;
     }
 
-    /* Allocate and set auth url */
-    ctx->auth_url = flb_sds_create_size(sizeof(FLB_AZ_LI_AUTH_URL_TMPLT) - 1 +
-                                        flb_sds_len(ctx->tenant_id));
-    if (!ctx->auth_url) {
-        flb_errno();
-        flb_az_li_ctx_destroy(ctx);
-        return NULL;
+    if (ctx->auth_url_override) {
+        ret = validate_auth_url_override(ins, ctx->auth_url_override);
+        if (ret == -1) {
+            flb_az_li_ctx_destroy(ctx);
+            return NULL;
+        }
+
+        ctx->auth_url = flb_sds_create(ctx->auth_url_override);
+        if (!ctx->auth_url) {
+            flb_errno();
+            flb_az_li_ctx_destroy(ctx);
+            return NULL;
+        }
+    }
+    else {
+        /* Allocate and set auth url */
+        ctx->auth_url = flb_sds_create_size(sizeof(FLB_AZ_LI_AUTH_URL_TMPLT) - 1 +
+                                            flb_sds_len(ctx->tenant_id));
+        if (!ctx->auth_url) {
+            flb_errno();
+            flb_az_li_ctx_destroy(ctx);
+            return NULL;
+        }
+        flb_sds_snprintf(&ctx->auth_url, flb_sds_alloc(ctx->auth_url),
+                        FLB_AZ_LI_AUTH_URL_TMPLT, ctx->tenant_id);
     }
-    flb_sds_snprintf(&ctx->auth_url, flb_sds_alloc(ctx->auth_url),
-                    FLB_AZ_LI_AUTH_URL_TMPLT, ctx->tenant_id);
 
     /* Allocate and set dce full url */
     ctx->dce_u_url = flb_sds_create_size(sizeof(FLB_AZ_LI_DCE_URL_TMPLT) - 1 +
diff --git a/src/flb_oauth2.c b/src/flb_oauth2.c
index e4fd405292c..7abe616448a 100644
--- a/src/flb_oauth2.c
+++ b/src/flb_oauth2.c
@@ -1201,6 +1201,7 @@ struct flb_oauth2 *flb_oauth2_create(struct flb_config *config,
     (void) expire_sec;
 
     oauth2_apply_defaults(&cfg);
+    cfg.enabled = FLB_TRUE;
     cfg.token_url = flb_sds_create(auth_url);
     cfg.refresh_skew = FLB_OAUTH2_DEFAULT_SKEW_SECS;
 
diff --git a/tests/internal/oauth2.c b/tests/internal/oauth2.c
index 95491968b3a..5206a324917 100644
--- a/tests/internal/oauth2.c
+++ b/tests/internal/oauth2.c
@@ -487,6 +487,26 @@ static struct flb_oauth2 *create_oauth_ctx(struct flb_config *config,
     return ctx;
 }
 
+static struct flb_oauth2 *create_legacy_oauth_ctx(struct flb_config *config,
+                                                  struct oauth2_mock_server *server)
+{
+    flb_sds_t token_url;
+    struct flb_oauth2 *ctx;
+
+    token_url = flb_sds_create_size(64);
+    TEST_CHECK(token_url != NULL);
+    if (!token_url) {
+        return NULL;
+    }
+
+    flb_sds_printf(&token_url, "http://127.0.0.1:%d/token", server->port);
+
+    ctx = flb_oauth2_create(config, token_url, 300);
+    flb_sds_destroy(token_url);
+
+    return ctx;
+}
+
 static int write_text_file(const char *path, const char *content)
 {
     FILE *fp;
@@ -948,6 +968,57 @@ void test_caching_and_refresh(void)
     flb_config_exit(config);
 }
 
+void test_legacy_create_manual_payload_flow(void)
+{
+    int ret;
+    char *token;
+    struct flb_config *config;
+    struct flb_oauth2 *ctx;
+    struct oauth2_mock_server server;
+
+    config = flb_config_init();
+    TEST_CHECK(config != NULL);
+
+    ret = oauth2_mock_server_start(&server, 3600, 0);
+    TEST_CHECK(ret == 0);
+
+    ctx = create_legacy_oauth_ctx(config, &server);
+    TEST_CHECK(ctx != NULL);
+
+#ifdef FLB_SYSTEM_MACOS
+    ret = oauth2_mock_server_wait_ready(&server);
+    TEST_CHECK(ret == 0);
+#endif
+
+    flb_oauth2_payload_clear(ctx);
+
+    ret = flb_oauth2_payload_append(ctx, "grant_type", -1,
+                                    "client_credentials", -1);
+    TEST_CHECK(ret == 0);
+
+    ret = flb_oauth2_payload_append(ctx, "client_id", -1, "legacy-id", -1);
+    TEST_CHECK(ret == 0);
+
+    ret = flb_oauth2_payload_append(ctx, "client_secret", -1,
+                                    "legacy-secret", -1);
+    TEST_CHECK(ret == 0);
+
+    token = flb_oauth2_token_get(ctx);
+    TEST_CHECK(token != NULL);
+    TEST_CHECK(server.token_requests == 1);
+    TEST_CHECK(strcmp(token, "mock-token-1") == 0);
+    TEST_CHECK(strstr(server.latest_token_request,
+                      "grant_type=client_credentials") != NULL);
+    TEST_CHECK(strstr(server.latest_token_request,
+                      "client_id=legacy-id") != NULL);
+    TEST_CHECK(strstr(server.latest_token_request,
+                      "client_secret=legacy-secret") != NULL);
+
+    flb_oauth2_destroy(ctx);
+    oauth2_mock_server_stop(&server);
+    flb_config_exit(config);
+}
+
 void test_private_key_jwt_body(void)
 {
     int ret;
@@ -1078,6 +1149,7 @@ TEST_LIST = {
      test_parse_rejects_missing_required_fields},
     {"parse_rejects_invalid_expires_in", test_parse_rejects_invalid_expires_in},
     {"caching_and_refresh", test_caching_and_refresh},
+    {"legacy_create_manual_payload_flow", test_legacy_create_manual_payload_flow},
     {"private_key_jwt_body", test_private_key_jwt_body},
     {"private_key_jwt_x5t_header", test_private_key_jwt_x5t_header},
     {0}