It sounded to me like a ground systems issue. Having worked 30 years launching rockets this doesn’t sound like a problem with Starliner.
Zero to do with Boeing.
Atlas-V has many launches under it’s belt so maybe the added complexity for the ground systems related to Starliner could be what got hosed? They need to sync up the ground system’s with the Launch Vehicle and their procedures to get a green board for launch. Especially when it all get turned over to the ground launch system/computer for the remaining 4 mimutes of terminal count.
Anyhow, it’s pretty embarrassing for ULA, they should have had all that ironed out by now.