+`GET /conversations/{domain}/{id}` and the legacy `GET /conversations/{id}` now return 404 (`no-conversation`) when the conversation is a meeting, on API versions prior to V16, instead of returning the conversation with `group_conv_type: null`. The legacy batch endpoint `GET /conversations?ids=…` — itself removed at V3, so only ever available on V1–V2 — likewise omits meeting conversations from its results. Meeting conversations remain fully accessible from V16 onwards. (WPB-26626)
