Recording Export API 400 on Digital Channel Metadata Filter

What is the reason this setting causes a 400 Bad Request when filtering by digital channel type?

The Recording Export API v2 fails immediately upon job creation. We are using Python SDK 2.14.0 against Genesys Cloud EU-West-1.

The payload includes a valid date range and S3 destination. The error occurs specifically when adding the digital_channel filter for WhatsApp transcripts.

Standard voice recordings export without issue. Legal discovery deadlines are tight and we need the full metadata chain of custody.