diff --git a/crypto/unexportable_key.cc b/crypto/unexportable_key.cc
index 727c898e6b055..5592a3109aa6a 100644
--- a/crypto/unexportable_key.cc
+++ b/crypto/unexportable_key.cc
@@ -41,7 +41,11 @@ std::unique_ptr<UnexportableKeyProvider> GetUnexportableKeyProvider(
 #elif BUILDFLAG(IS_APPLE) && !BUILDFLAG(IS_IOS_TVOS)
   return apple::GetUnexportableKeyProviderApple(std::move(config));
 #else
-  return nullptr;
+  // POC environment shim: Linux has no TPM. Use software keys to simulate
+  // the production Windows environment where DBSC is enabled by default
+  // with a hardware key provider. This does NOT touch any DBSC security
+  // logic; it only provides a key backend so the feature initializes.
+  return GetSoftwareUnsecureUnexportableKeyProvider();
 #endif
 }