I also modified yt_dlp. But I do not remember what I changed. Have fun

yt_dlp/extractor/gigya.py

@@ -0,0 +1,20 @@
+from .common import InfoExtractor
+
+from ..utils import (
+    ExtractorError,
+    urlencode_postdata,
+)
+
+
+class GigyaBaseIE(InfoExtractor):
+    def _gigya_login(self, auth_data):
+        auth_info = self._download_json(
+            'https://accounts.eu1.gigya.com/accounts.login', None,
+            note='Logging in', errnote='Unable to log in',
+            data=urlencode_postdata(auth_data))
+
+        error_message = auth_info.get('errorDetails') or auth_info.get('errorMessage')
+        if error_message:
+            raise ExtractorError(
+                'Unable to login: %s' % error_message, expected=True)
+        return auth_info