Congratulations @ATT. I'm on my 13th support technician to enable IP passthrough for my 5G Business account.  So far, 12 of your technicians are unfamiliar with your products, IP addressing and your own internal phone tree.  BTW, for a phone company, I've never had so many disconnected calls.  You should be ashamed.

One email or chat request to @Starlink and everything gets fixed. Immediately.  The first time.