The let(:channel) and the service's message.inbox.channel were different
object instances, so the chat_id / business_connection_id stubs on the
test instance never applied to the service. Other examples masked it
because they only counted requests; the business-chat example matches
on body and tripped. Set the values via conversation.additional_attributes
(where the channel methods actually read from) instead of stubbing.
Tanmay Deep Sharma
461292fb2b