diff --git a/app/auth.py b/app/auth.py
index fbced09..a36b1d6 100644
--- a/app/auth.py
+++ b/app/auth.py
@@ -101,9 +101,9 @@ async def exchange_token(user_token: str, url: str) -> str:
     provider = settings.backend_auth_config[url].token_provider
     token_prefix = settings.backend_auth_config[url].token_prefix
 
-    if not provider or not token_prefix:
+    if not provider:
         raise ValueError(
-            f"Backend '{url}' must define 'token_provider' and 'token_prefix'"
+            f"Backend '{url}' must define 'token_provider'"
         )
 
     platform_token = await _exchange_token_for_provider(
diff --git a/tests/test_auth.py b/tests/test_auth.py
index 5fb9805..881fe3b 100644
--- a/tests/test_auth.py
+++ b/tests/test_auth.py
@@ -32,27 +32,6 @@ async def test_exchange_token_missing_provider():
             settings.backend_auth_config[url] = original_config
 
 
-@pytest.mark.asyncio
-async def test_exchange_token_missing_token_prefix():
-    url = "https://openeo.vito.be"
-    original_config = settings.backend_auth_config.get(url)
-
-    try:
-        # Create a config without token_prefix
-        settings.backend_auth_config[url] = BackendAuthConfig(
-            auth_method=AuthMethod.USER_CREDENTIALS,
-            token_provider="openeo",
-            token_prefix=None,
-        )
-
-        with pytest.raises(ValueError, match="must define"):
-            await exchange_token("user-token", url)
-    finally:
-        # Restore original config
-        if original_config:
-            settings.backend_auth_config[url] = original_config
-
-
 @pytest.mark.asyncio
 @patch(
     "app.auth._exchange_token_for_provider",