A team member gave himself a new job title in his mail signature and asked for new business cards. I was the team lead and moving out of this position at this moment. I can leave it to my replacement, but the issue really bothers me and I want to support the new lead in resolving this issue.
What we tried: address the issue in a private conversation.
Result: He feels like it describes what he is doing and refuses to change it.
What we tried: Talked to the CEO about it.
Result: He wants to address it after an important project is finished to not ruin the "momentum" so close to the the deadline.
My issue with this is that the longer the self-assigned job title stands, the more accepted it will become by co-workers and clients.
How can I address this without undercutting, but rather supporting the new lead and resolve it without firing people?