Issue with Openshift Pipeline Event Listener

We are having an issue with an Event Listener for a Web Hook used for Bitbucket that is getting an error

"message":"interceptor stopped trigger processing: rpc error: code = FailedPrecondition desc = event type is not allowed"

The Trigger has an intercepter ref

interceptors:
- ref:
name: "bitbucket"
params:
- name: eventTypes
value:
- pullrequest:fulfilled

Which is supposed to be used for PR merges. I do see that the event=key from Bitbucket is: Type: pullrequest:fulfilled

Does anyone have any idea what might be the issue?