Error 500 on submit-form

Good afternoon everybody. I’m having an error in Camunda Rest API, more precisely when hitting the post route:

http://localhost:8080/engine-rest/process-definition/key/Process_1/submit-form

With Process_1 as Definition Key of my process. If I go in cockpit dashboard, my process has Process_1 definition key, however unlike other processes it seems to be a default name. If I try with another process which has key refund-test, it works and I have 200 answer (exactly with same payload). Is it an authorization issue ?
Thanks

Hi @pvermeil
can you share your BPMN file and also tell us if you see any errors in the server log?

Greetings
Felix