diff --git a/litellm/router.py b/litellm/router.py
index 535072d5fcf..d74f7fa2093 100644
--- a/litellm/router.py
+++ b/litellm/router.py
@@ -5298,8 +5298,14 @@ class Router(DeprecatedRouterMembers):
         if credential_name:
             credential_tag: Final = f"Credential: {credential_name}"
             existing_tags = kwargs[metadata_variable_name].get("tags") or []
-            if credential_tag not in existing_tags:
-                existing_tags.append(credential_tag)
+            # Strip Credential: tags from any previous deployment attempt so they
+            # do not leak into fallback routing tag checks (fixes #25276).
+            existing_tags = [
+                t
+                for t in existing_tags
+                if not (isinstance(t, str) and t.startswith("Credential: "))
+            ]
+            existing_tags.append(credential_tag)
             kwargs[metadata_variable_name]["tags"] = existing_tags
 
         from litellm.llms.github_copilot.per_user_auth import (