Hi there, I've found this question without answer.
I have the same issue. I'm trying to integrate my Firebase project with Jira to create bugs from there. But when I add my API Token following this documentation, I get an error about missing credentials.
I am the Firebase Project owner and I have all permission for the Jira project. So do I also need to be the owner of the Jira project? Or is there something else I'm missing?