diff --git a/sdk/monitor/azure-monitor-opentelemetry-exporter/azure/monitor/opentelemetry/exporter/export/trace/_sampling.py b/sdk/monitor/azure-monitor-opentelemetry-exporter/azure/monitor/opentelemetry/exporter/export/trace/_sampling.py
index 130ede8e4125..e3378780b578 100644
--- a/sdk/monitor/azure-monitor-opentelemetry-exporter/azure/monitor/opentelemetry/exporter/export/trace/_sampling.py
+++ b/sdk/monitor/azure-monitor-opentelemetry-exporter/azure/monitor/opentelemetry/exporter/export/trace/_sampling.py
@@ -95,5 +95,5 @@ def azure_monitor_opentelemetry_sampler_factory(sampler_argument):  # pylint: di
     try:
         rate = float(sampler_argument)
         return ApplicationInsightsSampler(rate)
-    except ValueError:
+    except (ValueError, TypeError):
         return ApplicationInsightsSampler()
diff --git a/sdk/monitor/azure-monitor-opentelemetry-exporter/tests/trace/test_sampling.py b/sdk/monitor/azure-monitor-opentelemetry-exporter/tests/trace/test_sampling.py
index 195cd9a438c2..d443c38f381c 100644
--- a/sdk/monitor/azure-monitor-opentelemetry-exporter/tests/trace/test_sampling.py
+++ b/sdk/monitor/azure-monitor-opentelemetry-exporter/tests/trace/test_sampling.py
@@ -5,12 +5,18 @@
 
 from azure.monitor.opentelemetry.exporter.export.trace._sampling import (
     ApplicationInsightsSampler,
+    azure_monitor_opentelemetry_sampler_factory,
 )
 
 # pylint: disable=protected-access
 class TestApplicationInsightsSampler(unittest.TestCase):
 
     def test_constructor(self):
+        sampler = ApplicationInsightsSampler()
+        self.assertEqual(sampler._ratio, 1.0)
+        self.assertEqual(sampler._sample_rate, 100)
+
+    def test_constructor_ratio(self):
         sampler = ApplicationInsightsSampler(0.75)
         self.assertEqual(sampler._ratio, 0.75)
         self.assertEqual(sampler._sample_rate, 75)
@@ -38,3 +44,15 @@ def test_should_sample_not_sampled(self, score_mock):
         result = sampler.should_sample(None, 0, "test")
         self.assertEqual(result.attributes["_MS.sampleRate"], 50)
         self.assertFalse(result.decision.is_sampled())
+
+    def test_sampler_factory(self):
+        sampler = azure_monitor_opentelemetry_sampler_factory("1.0")
+        self.assertEqual(sampler._ratio, 1.0)
+
+    def test_sampler_factory_none(self):
+        sampler = azure_monitor_opentelemetry_sampler_factory(None)
+        self.assertEqual(sampler._ratio, 1.0)
+
+    def test_sampler_factory_empty(self):
+        sampler = azure_monitor_opentelemetry_sampler_factory("")
+        self.assertEqual(sampler._ratio, 1.0)
diff --git a/sdk/monitor/azure-monitor-opentelemetry/CHANGELOG.md b/sdk/monitor/azure-monitor-opentelemetry/CHANGELOG.md
index 1643d6aaa7b6..7418f4e1b29f 100644
--- a/sdk/monitor/azure-monitor-opentelemetry/CHANGELOG.md
+++ b/sdk/monitor/azure-monitor-opentelemetry/CHANGELOG.md
@@ -4,6 +4,9 @@
 
 ### Features Added
 
+- Enable sampling for attach
+    ([#35218](https://github.com/Azure/azure-sdk-for-python/pull/35218))
+
 ### Breaking Changes
 
 ### Bugs Fixed
diff --git a/sdk/monitor/azure-monitor-opentelemetry/azure/monitor/opentelemetry/_autoinstrumentation/distro.py b/sdk/monitor/azure-monitor-opentelemetry/azure/monitor/opentelemetry/_autoinstrumentation/distro.py
index 364c80df0cf8..23935eb87653 100644
--- a/sdk/monitor/azure-monitor-opentelemetry/azure/monitor/opentelemetry/_autoinstrumentation/distro.py
+++ b/sdk/monitor/azure-monitor-opentelemetry/azure/monitor/opentelemetry/_autoinstrumentation/distro.py
@@ -17,6 +17,7 @@
 from opentelemetry.sdk.environment_variables import (
     _OTEL_PYTHON_LOGGING_AUTO_INSTRUMENTATION_ENABLED,
     OTEL_EXPERIMENTAL_RESOURCE_DETECTORS,
+    OTEL_TRACES_SAMPLER,
 )
 
 from azure.core.settings import settings
@@ -70,6 +71,9 @@ def _configure_auto_instrumentation() -> None:
     environ.setdefault(
         OTEL_LOGS_EXPORTER, "azure_monitor_opentelemetry_exporter"
     )
+    environ.setdefault(
+        OTEL_TRACES_SAMPLER, "azure_monitor_opentelemetry_sampler"
+    )
     environ.setdefault(
         _OTEL_PYTHON_LOGGING_AUTO_INSTRUMENTATION_ENABLED, "true"
     )
diff --git a/sdk/monitor/azure-monitor-opentelemetry/azure/monitor/opentelemetry/_configure.py b/sdk/monitor/azure-monitor-opentelemetry/azure/monitor/opentelemetry/_configure.py
index 4bd2b00c6766..d4745c3e8220 100644
--- a/sdk/monitor/azure-monitor-opentelemetry/azure/monitor/opentelemetry/_configure.py
+++ b/sdk/monitor/azure-monitor-opentelemetry/azure/monitor/opentelemetry/_configure.py
@@ -168,7 +168,7 @@ def _setup_instrumentations(configurations: Dict[str, ConfigurationValue]):
             continue
         try:
             # Check if dependent libraries/version are installed
-            conflict = get_dist_dependency_conflicts(entry_point.dist)
+            conflict = get_dist_dependency_conflicts(entry_point.dist) # type: ignore
             if conflict:
                 _logger.debug(
                     "Skipping instrumentation %s: %s",
diff --git a/sdk/monitor/azure-monitor-opentelemetry/tests/autoinstrumentation/test_distro.py b/sdk/monitor/azure-monitor-opentelemetry/tests/autoinstrumentation/test_distro.py
index 1c45d518a30a..c4a59d293109 100644
--- a/sdk/monitor/azure-monitor-opentelemetry/tests/autoinstrumentation/test_distro.py
+++ b/sdk/monitor/azure-monitor-opentelemetry/tests/autoinstrumentation/test_distro.py
@@ -1,3 +1,4 @@
+from os import environ
 import warnings
 from unittest import TestCase
 from unittest.mock import patch
@@ -13,6 +14,7 @@
 
 
 class TestDistro(TestCase):
+    @patch.dict("os.environ", {}, clear=True)
     @patch("azure.monitor.opentelemetry._autoinstrumentation.distro._is_attach_enabled", return_value=True)
     @patch("azure.monitor.opentelemetry._autoinstrumentation.distro.settings")
     @patch(
@@ -30,8 +32,56 @@ def test_configure(self, mock_diagnostics, azure_core_mock, attach_mock):
         self.assertEqual(
             azure_core_mock.tracing_implementation, OpenTelemetrySpan
         )
+        self.assertEqual(
+            environ,
+            {
+                "OTEL_METRICS_EXPORTER": "azure_monitor_opentelemetry_exporter",
+                "OTEL_TRACES_EXPORTER": "azure_monitor_opentelemetry_exporter",
+                "OTEL_LOGS_EXPORTER": "azure_monitor_opentelemetry_exporter",
+                "OTEL_TRACES_SAMPLER": "azure_monitor_opentelemetry_sampler",
+                "OTEL_PYTHON_LOGGING_AUTO_INSTRUMENTATION_ENABLED": "true",
+                "OTEL_EXPERIMENTAL_RESOURCE_DETECTORS": "azure_app_service",
+            }
+        )
+
+    @patch.dict("os.environ", {
+        "OTEL_METRICS_EXPORTER": "custom_metrics_exporter",
+        "OTEL_TRACES_EXPORTER": "custom_traces_exporter",
+        "OTEL_LOGS_EXPORTER": "custom_logs_exporter",
+        "OTEL_TRACES_SAMPLER": "custom_traces_sampler",
+        "OTEL_PYTHON_LOGGING_AUTO_INSTRUMENTATION_ENABLED": "false",
+        "OTEL_EXPERIMENTAL_RESOURCE_DETECTORS": "custom_resource_detector",
+    }, clear=True)
+    @patch("azure.monitor.opentelemetry._autoinstrumentation.distro._is_attach_enabled", return_value=True)
+    @patch("azure.monitor.opentelemetry._autoinstrumentation.distro.settings")
+    @patch(
+        "azure.monitor.opentelemetry._autoinstrumentation.distro.AzureDiagnosticLogging"
+    )
+    def test_configure_env_vars_set(self, mock_diagnostics, azure_core_mock, attach_mock):
+        distro = AzureMonitorDistro()
+        with warnings.catch_warnings():
+            warnings.simplefilter("error")
+            distro.configure()
+        mock_diagnostics.info.assert_called_once_with(
+            "Azure Monitor OpenTelemetry Distro configured successfully.",
+            _ATTACH_SUCCESS_DISTRO
+        )
+        self.assertEqual(
+            azure_core_mock.tracing_implementation, OpenTelemetrySpan
+        )
+        self.assertEqual(
+            environ,
+            {
+                "OTEL_METRICS_EXPORTER": "custom_metrics_exporter",
+                "OTEL_TRACES_EXPORTER": "custom_traces_exporter",
+                "OTEL_LOGS_EXPORTER": "custom_logs_exporter",
+                "OTEL_TRACES_SAMPLER": "custom_traces_sampler",
+                "OTEL_PYTHON_LOGGING_AUTO_INSTRUMENTATION_ENABLED": "false",
+                "OTEL_EXPERIMENTAL_RESOURCE_DETECTORS": "custom_resource_detector",
+            }
+        )
 
-    @patch.dict("os.environ", {"OTEL_PYTHON_DISABLED_INSTRUMENTATIONS": " flask,azure_sdk , urllib3"})
+    @patch.dict("os.environ", {"OTEL_PYTHON_DISABLED_INSTRUMENTATIONS": " flask,azure_sdk , urllib3"}, clear=True)
     @patch("azure.monitor.opentelemetry._autoinstrumentation.distro._is_attach_enabled", return_value=True)
     @patch("azure.monitor.opentelemetry._autoinstrumentation.distro.settings")
     @patch(