diff --git a/sentinelhub/areas.py b/sentinelhub/areas.py
index fdf75ff7..2580c599 100644
--- a/sentinelhub/areas.py
+++ b/sentinelhub/areas.py
@@ -712,7 +712,7 @@ def _parse_to_pair(parameter: T | tuple[T, T], allowed_types: tuple[type, ...],
 
     parameter = cast(T, parameter)
     if isinstance(parameter, allowed_types):
-        return parameter, parameter
+        return parameter, parameter  # type: ignore[return-value]  # mypy 1.6 fails to do type narrowing here
 
     raise ValueError(
         f"Parameter {param_name} must be a single instance or a pair, with allowed types {allowed_types}, but"
diff --git a/sentinelhub/download/session.py b/sentinelhub/download/session.py
index 6f167f7a..d73ea9b9 100644
--- a/sentinelhub/download/session.py
+++ b/sentinelhub/download/session.py
@@ -141,6 +141,7 @@ def _fetch_token(self, request: DownloadRequest) -> JsonDict:
                 client_id=self.config.sh_client_id,
                 client_secret=self.config.sh_client_secret,
                 headers={**self.DEFAULT_HEADERS, **SHConstants.HEADERS},
+                include_client_id=True,
             )
 
     @staticmethod