It's OK to share your public account ID, but it's usually not necessary if you just give me your ticket number. I removed the ID from my quote above anyway.
By the way, in the settings is written:
Username xxxxxx
Private identifier for your account. Never share this with a 3rd party.
Public Account ID xxxxxxxxxxx
Public identifier for your account. It's safe to share this ID with 3rd parties.

I don't think the Username is the private identifier?! That would be very strange
