BLUF: When is it ok (i.e. not unprofessional) to cc someone's manager on a follow-up email?
I'm remote from all of my peers and their directs. I need another manager (a direct of one of my peers) to follow-up on some issues that were escalated to him & his team. I have exchanged emails with him previously on some of these issues; some were resolved, but some remain open, and new ones have since been escalated.
I now need to follow-up with him again, and I'm considering cc'ing his Director (my peer) on the message, as well. However, I don't want to be perceived as "throwing him under the bus." Any opinions on this?
Wondering if I'm overthinking this, as well (yes; I'm a high C).