diff --git a/litellm/llms/bedrock/claude_platform/common_utils.py b/litellm/llms/bedrock/claude_platform/common_utils.py
index 9dc57119358..f02ade6be75 100644
--- a/litellm/llms/bedrock/claude_platform/common_utils.py
+++ b/litellm/llms/bedrock/claude_platform/common_utils.py
@@ -1,8 +1,12 @@
-from typing import Literal, Optional, Tuple
+from typing import Literal, Optional, Protocol, Tuple
 
 import litellm
 from litellm._logging import verbose_logger
 from litellm.llms.bedrock.base_aws_llm import BaseAWSLLM
+
+
+class _SupportsGet(Protocol):
+    def get(self, key: str, default: object = None) -> object: ...
 from litellm.secret_managers.main import get_secret_str
 
 CLAUDE_PLATFORM_SERVICE_NAME: Literal["aws-external-anthropic"] = (
@@ -74,8 +78,8 @@ def filter_claude_platform_request_body(
     }
 
 
-def _resolve_unsupported_override(
-    litellm_params: dict,
+def resolve_unsupported_override(
+    litellm_params: _SupportsGet,
 ) -> Optional[frozenset[str]]:
     """Read ``claude_platform_unsupported_params`` from litellm_params.
 
@@ -87,7 +91,7 @@ def _resolve_unsupported_override(
     if raw is None:
         return None
     if isinstance(raw, (list, set, frozenset, tuple)):
-        return frozenset(raw)
+        return frozenset(str(item) for item in raw)
     return None
 
 
diff --git a/litellm/llms/bedrock/claude_platform/messages_transformation.py b/litellm/llms/bedrock/claude_platform/messages_transformation.py
index 5b9f7c2c7c2..778c8165790 100644
--- a/litellm/llms/bedrock/claude_platform/messages_transformation.py
+++ b/litellm/llms/bedrock/claude_platform/messages_transformation.py
@@ -10,7 +10,7 @@ from litellm.types.router import GenericLiteLLMParams
 
 from .common_utils import (
     BedrockClaudePlatformMixin,
-    _resolve_unsupported_override,
+    resolve_unsupported_override,
     filter_claude_platform_request_body,
     strip_claude_platform_route,
 )
@@ -67,7 +67,7 @@ class BedrockClaudePlatformMessagesConfig(
         litellm_params: GenericLiteLLMParams,
         headers: dict,
     ) -> Dict:
-        unsupported_override = _resolve_unsupported_override(litellm_params)
+        unsupported_override = resolve_unsupported_override(litellm_params)
         anthropic_messages_optional_request_params = (
             filter_claude_platform_request_body(
                 anthropic_messages_optional_request_params,
diff --git a/litellm/llms/bedrock/claude_platform/transformation.py b/litellm/llms/bedrock/claude_platform/transformation.py
index 1b2e747db0a..e37c2f03aeb 100644
--- a/litellm/llms/bedrock/claude_platform/transformation.py
+++ b/litellm/llms/bedrock/claude_platform/transformation.py
@@ -7,7 +7,7 @@ from litellm.types.llms.openai import AllMessageValues
 
 from .common_utils import (
     BedrockClaudePlatformMixin,
-    _resolve_unsupported_override,
+    resolve_unsupported_override,
     filter_claude_platform_request_body,
 )
 
@@ -94,7 +94,7 @@ class BedrockClaudePlatformConfig(BedrockClaudePlatformMixin, AnthropicConfig):
         litellm_params: dict,
         headers: dict,
     ) -> dict:
-        unsupported_override = _resolve_unsupported_override(litellm_params)
+        unsupported_override = resolve_unsupported_override(litellm_params)
         optional_params = filter_claude_platform_request_body(
             optional_params, unsupported_override=unsupported_override
         )