diff --git a/sdk/monitor/azure-monitor-opentelemetry/CHANGELOG.md b/sdk/monitor/azure-monitor-opentelemetry/CHANGELOG.md
index ebb60221bf37..351a2ae3fd75 100644
--- a/sdk/monitor/azure-monitor-opentelemetry/CHANGELOG.md
+++ b/sdk/monitor/azure-monitor-opentelemetry/CHANGELOG.md
@@ -8,6 +8,9 @@
 
 ### Bugs Fixed
 
+- Fix `configure_azure_monitor` options being ignored
+  ([#44131](https://github.com/Azure/azure-sdk-for-python/pull/44131))
+
 ### Other Changes
 
 ## 1.8.2 (2025-11-14)
diff --git a/sdk/monitor/azure-monitor-opentelemetry/azure/monitor/opentelemetry/_utils/configurations.py b/sdk/monitor/azure-monitor-opentelemetry/azure/monitor/opentelemetry/_utils/configurations.py
index 3171114af8bf..faf825c6f2da 100644
--- a/sdk/monitor/azure-monitor-opentelemetry/azure/monitor/opentelemetry/_utils/configurations.py
+++ b/sdk/monitor/azure-monitor-opentelemetry/azure/monitor/opentelemetry/_utils/configurations.py
@@ -164,7 +164,7 @@ def _default_sampling_ratio(configurations):
                 default_value,
                 e,
             )
-            configurations[SAMPLING_TRACES_PER_SECOND_ARG] = default_value
+            configurations.setdefault(SAMPLING_TRACES_PER_SECOND_ARG, default_value)
 
     # Handle fixed percentage sampler
     elif sampler_type == FIXED_PERCENTAGE_SAMPLER:
@@ -183,11 +183,11 @@ def _default_sampling_ratio(configurations):
                 default_value,
                 e,
             )
-            configurations[SAMPLING_RATIO_ARG] = default_value
+            configurations.setdefault(SAMPLING_RATIO_ARG, default_value)
 
     # Handle all other cases (no sampler type specified or unsupported sampler type)
     else:
-        configurations[SAMPLING_RATIO_ARG] = default_value
+        configurations.setdefault(SAMPLING_RATIO_ARG, default_value)
         if sampler_type is not None:
             _logger.error(  # pylint: disable=C
                 "Invalid argument for the sampler to be used for tracing. "