Outbound Campaign Export 400 Bad Request on Digital Channel Metadata

400 Bad Request

Why does this setting cause a 400 error when filtering outbound digital interactions? We use Python SDK 2.14.0 with Genesys Cloud EU-West-1. The bulk export job for legal discovery fails immediately upon creation when including WhatsApp transcripts from our BYOC edge. Voice calls export fine, but digital metadata triggers the validation failure. Any insights on the filter structure?