@StephenOTT This is a Receive Task issue here, the first one in the BPMN before any RMQ stuff. I ended up testing my message request on RequestBin and here is what I send exactly to Camunda's message endpoint
What I get when I'm using Postman to reproduce the issue :
I don't know why a < b r / > markup is reported
edit : are the messageName and businessKey the only mandatory payload fields for a message call ? https://docs.camunda.org/manual/7.7/reference/rest/message/post-message/
I don't meet this issue in my staging environment, only local, given that in staging I have the same payload structure to send message.