Short version, the topic exists, the API is enabled. I'm setting the

eventType

to

providers/cloud.pubsub/eventTypes/topic.publish

and the

resource

for that event type to an existing topic,

projects/olivertesting7/topics/generate-highlight-event

. The same code swapping only

event_type

to

trigger_http

works fine so I'm pretty sure this issue is trying to make it pubsub triggered rather than http triggered. Any help would be great!